Introduction: Clearing the Confusion Between Washing Soda and Borax
In the realm of natural cleaning solutions, washing soda and borax frequently take center stage. Both are popular ingredients in DIY laundry detergents, household cleaners, and green-living routines. Given their similar appearances — white, powdery substances stored in boxes — it’s easy to assume they are interchangeable. But is washing soda the same as borax?
The short answer is no — while both are effective cleaning agents and often used together, washing soda and borax are chemically and functionally different substances. This article dives deep into their compositions, uses, safety, and effectiveness to clarify their distinctions and help you make informed decisions for your cleaning needs.
What Is Washing Soda?
Chemical Composition and Scientific Name
Washing soda, scientifically known as sodium carbonate (Na₂CO₃), is a naturally occurring salt derived from the mineral trona or produced via the Solvay process. It is a strong alkaline compound with a pH level of around 11 when dissolved in water. This high alkalinity plays a crucial role in its cleaning power.
Natural Sources and Production
Washing soda can be mined from natural deposits, particularly in places like Green River, Wyoming, where vast trona reserves exist. The raw trona is processed and refined to produce pure sodium carbonate. It can also be manufactured synthetically, which allows for consistent quality in commercial products.
Common Uses and Cleaning Properties
Washing soda excels as a water softener and stain remover. Its primary function in laundry is to:
- Lift dirt and grease from fabrics
- Neutralize acidic odors
- Boost the effectiveness of soap by softening hard water
- Remove mineral deposits from washing machines
It is particularly effective in treating tough stains like oil, grease, and sweat. Additionally, washing soda is used in homemade detergents, as a degreaser for kitchen surfaces, and even in some pool maintenance routines to balance pH.
What Is Borax?
Chemical Composition and Scientific Name
Borax, scientifically named sodium tetraborate decahydrate (Na₂B₄O₇·10H₂O), is a naturally occurring mineral compound rich in boron. It has a slightly alkaline pH — about 9.3 in solution — making it less caustic than washing soda.
Geological Origins and Harvesting
Borax is typically mined from dry lake beds, especially in desert regions like Death Valley in California and parts of Turkey and South America. Historically, it was transported across desert trails by large “20-mule teams,” a fact that inspired the popular brand name.
Versatile Uses Beyond Cleaning
While borax is highly effective as a cleaning agent, its applications extend much further:
- Mold and mildew inhibition
- Pest control (especially against ants and cockroaches)
- Flame retardant in textiles and cellulose insulation
- Preservative in taxidermy and crafts
In household cleaning, borax deodorizes, disinfects, and softens water, making it a valuable laundry booster — though it doesn’t dissolve grease as aggressively as washing soda.
Side-by-Side Comparison: Washing Soda vs. Borax
| Feature | Washing Soda (Sodium Carbonate) | Borax (Sodium Tetraborate) |
|---|---|---|
| Chemical Formula | Na₂CO₃ | Na₂B₄O₇·10H₂O |
| pH in Solution | ~11 (Highly Alkaline) | ~9.3 (Moderately Alkaline) |
| Primary Function | Water softening, degreasing, stain lifting | Disinfecting, deodorizing, mild cleaning |
| Natural Source | Trona ore, Solvay process | Lake bed deposits |
| Toxicity Level | Corrosive; avoid skin/eye contact | Low toxicity; not for ingestion |
| Common Brand | Arm & Hammer Super Washing Soda | 20 Mule Team Borax |
This table highlights the key chemical and functional distinctions between the two substances.
How Are They Used Differently in Cleaning?
Washing Soda in Laundry
Washing soda is a powerhouse when it comes to lifting tough stains and softening water. When added to laundry (about ½ cup per load), it helps prevent minerals in hard water from binding to fabrics, resulting in cleaner, brighter clothes. It is especially effective on greasy or oily stains.
However, due to its high alkalinity, washing soda should not be used directly on delicate fabrics such as silk or wool. Overuse may weaken fibers over time. It’s best combined with gentle detergents or used in a pre-soak for heavily soiled garments.
Borax in Laundry and Household Use
Borax enhances the cleaning power of detergents by helping to break down organic stains and inhibit mold. It is often used in combination with other ingredients in homemade detergents. A typical laundry recipe might include 1 cup borax, 1 cup washing soda, and 1 bar of grated soap.
Beyond laundry, borax is a staple in many natural disinfecting sprays. For example, a simple solution of 2 tablespoons borax in 2 cups of warm water can be used to clean kitchen counters and bathrooms. Its mild antifungal and antibacterial properties make it a go-to for mold-prone areas like basements and bathrooms.
Combining Washing Soda and Borax
Many DIY cleaning enthusiasts use washing soda and borax together in homemade recipes. Their combined alkalinity produces a synergistic effect, making detergents more efficient and affordable. For instance, the popular “Homemade Laundry Detergent” often includes both ingredients for enhanced performance.
When combined:
- Washing soda softens water and breaks down grease
- Borax kills odor-causing bacteria and brightens whites
Still, caution is advised — the mixture should be stored safely out of reach of children and pets.
Safety Considerations and Handling Tips
Washing Soda Safety
Because washing soda has a high pH level, it can be irritating to the skin, eyes, and respiratory system. Always wear gloves when handling it, and avoid inhaling the powder. It is not safe for ingestion and can cause gastrointestinal issues if consumed.
Keep washing soda away from acidic substances like vinegar, as sudden chemical reactions can produce gas and potentially dangerous fumes. In fact, mixing washing soda with vinegar neutralizes its cleaning power — reducing its effectiveness.
Pro Tip: Store washing soda in a cool, dry place in an airtight container. It has a long shelf life if kept from moisture.
Borax Safety
While borax is generally considered low in toxicity for external use, it is not without risks. The Environmental Working Group (EWG) has classified borax as a moderate hazard due to potential reproductive and developmental concerns when exposed in large quantities over time.
Borax should never be ingested and should be kept away from children and pets. Pregnant women and individuals with sensitive skin may want to limit direct exposure. Always follow recommended usage guidelines and ventilate the room when using borax-based cleaning solutions.
Despite its widespread use, the European Union has restricted borax in consumer products due to health concerns, while in the U.S. it remains available over the counter.
Can You Substitute One for the Other?
While washing soda and borax are often used in similar recipes, they are not direct substitutes. Here’s why:
Differences in Alkalinity
Washing soda’s higher pH makes it more aggressive at removing grease and neutralizing acids. Borax, with its milder alkaline nature, works better at disinfecting and maintaining water balance without damaging surfaces.
For example, substituting borax for washing soda in a degreasing scrub may result in less effective cleaning, especially on oily kitchen grime. On the other hand, using washing soda in place of borax in a disinfecting spray might be too harsh for surfaces like wood or vinyl.
Effect on Fabrics
In laundry, using washing soda instead of borax increases cleaning power but carries a higher risk of damaging delicate fabrics. Borax provides a gentler cleansing action and is safer for use on a wider variety of materials.
That said, in a pinch, you can use one or the other — just adjust quantities and expectations accordingly. For general cleaning, borax may be adequate. For heavy-duty tasks, washing soda delivers stronger results.
Eco-Friendliness and Environmental Impact
Biodegradability and Water Safety
Both washing soda and borax are considered relatively eco-friendly compared to synthetic detergents. They are naturally derived, break down over time, and do not release microplastics into water systems.
However, their impact on aquatic life varies. While sodium carbonate can alter water pH temporarily, it generally poses low ecological risk when used in typical household amounts. Borax, though naturally occurring, contains boron, which in high concentrations can be toxic to plants and aquatic organisms.
Important: Avoid dumping large quantities of either compound directly into drains or natural water bodies. Use only recommended amounts, and dispose of cleaning solutions responsibly.
Sustainable Sourcing
The mining of both compounds does have an environmental footprint. Large-scale extraction can disrupt ecosystems and require significant energy. However, because both substances are highly effective in small amounts, their overall environmental impact per use is relatively low.
To minimize impact, consider purchasing from companies that prioritize sustainable mining and transparent sourcing practices.
Different Forms and Availability
Washing Soda Variants
Washing soda is typically sold as a fine white powder. One interesting fact: you can make washing soda at home by baking baking soda (sodium bicarbonate). When heated to about 400°F (200°C) for an hour, baking soda loses water and carbon dioxide, transforming into sodium carbonate:
- Preheat oven to 400°F
- Sprinkle baking soda on a baking sheet
- Bake for 1 hour, stirring occasionally
- Allow to cool — you now have homemade washing soda
This DIY method is cost-effective and useful for those seeking to reduce packaging waste.
Borax Variants
Borax is most commonly sold as a granulated powder. It is stable at room temperature and rarely changes form. While there are industrial-grade and laboratory-grade forms, household borax is purified for safe use in cleaning and laundry.
It’s important to note that while some people use borax for health or cosmetic purposes (like as an ingredient in toothpaste), such usage is controversial and not endorsed by medical professionals.
Myths and Misconceptions
Baking Soda, Washing Soda, and Borax Are the Same
This is one of the most common misconceptions. Baking soda (sodium bicarbonate), washing soda (sodium carbonate), and borax (sodium tetraborate) are three distinct chemicals with different uses and properties.
Key Differences at a Glance:
- Baking soda: Mild base, pH 8.3; used in cooking, deodorizing, light cleaning
- Washing soda: Strong base, pH 11; used in heavy-duty cleaning and water softening
- Borax: Moderate base, pH 9.3; used in disinfecting, laundry boosting, and pest control
Confusing these can lead to ineffective cleaning or even damage to surfaces or fabrics.
Borax is Always Natural and Safe
While borax occurs naturally, “natural” does not automatically mean “safe for all uses.” As noted earlier, borax can pose health risks with prolonged exposure or improper handling. Always treat it with respect as a chemical substance, not a health supplement.
When to Use Each: Practical Guidelines
Use Washing Soda When You Need:
- Heavy-duty stain removal
- Hard water softening in laundry
- Deep cleaning of greasy kitchen surfaces
- Descaling of washing machines or kettles
Use Borax When You Need:
- Mild disinfecting and deodorizing
- Boosting detergent performance
- Preventing mold and mildew in damp areas
- Making natural pest control solutions
Final Verdict: Are Washing Soda and Borax the Same?
To reiterate: Washing soda and borax are not the same. They are both alkaline, powdered cleaning agents derived from natural minerals, but their chemical structures, pH levels, cleaning mechanisms, and safety profiles differ significantly.
Washing soda is your go-to for removing grease and softening water, thanks to its high alkalinity. Borax shines in deodorizing, disinfecting, and mildly boosting laundry performance. They complement each other beautifully in cleaning routines but are not interchangeable in a one-to-one ratio.
Understanding their differences empowers you to use them more effectively and safely. Whether you’re crafting a homemade detergent, tackling a grimy stovetop, or keeping mold at bay, choosing the right powder makes all the difference.
Conclusion: Informed Choices for Clean, Healthy Homes
The quest for natural, non-toxic cleaning often leads us to pantry staples like washing soda and borax. While they may sit side by side on the shelf and look alike, they serve distinct purposes in the cleaning world.
Knowing that washing soda is sodium carbonate and borax is sodium tetraborate helps clarify their unique strengths. One excels in degreasing; the other in disinfecting. One is highly alkaline; the other moderately so. Both are valuable — but only when used correctly.
As eco-conscious consumers, it’s our responsibility to understand what we’re bringing into our homes. By distinguishing between washing soda and borax, you’re not just cleaning smarter — you’re protecting your family, your fabrics, and the environment.
So next time you reach for that white powder, pause and ask: Is this washing soda or borax? Your cleaning routine — and your results — will thank you.
Is washing soda the same as borax?
No, washing soda and borax are not the same, although they are both natural, mineral-based cleaning agents often used in household cleaning and laundry. Washing soda, scientifically known as sodium carbonate (Na₂CO₃), is a strong alkaline compound derived from the mineral trona or produced through the Solvay process. Borax, on the other hand, is sodium tetraborate decahydrate (Na₂B₄O₇·10H₂O), a compound containing boron, which occurs naturally in evaporite deposits from dried lakes.
While both substances can enhance cleaning performance, they differ significantly in chemical composition, pH levels, and applications. Washing soda has a pH of around 11, making it more alkaline than borax, which has a pH of about 9.5. This higher alkalinity makes washing soda more effective at breaking down grease and oil, but it’s also harsher on fabrics and skin. Borax, though milder, acts as a water softener, disinfectant, and fungicide, offering broader utility in pest control and mildew prevention.
Can I substitute borax for washing soda in laundry?
Borax can be used as a partial substitute for washing soda in laundry, but it won’t deliver the same cleaning power, especially when dealing with hard water or heavy soil. Washing soda excels at water softening by binding to calcium and magnesium ions, allowing detergents to work more efficiently. Borax does soften water to some extent, but it is less effective in this role due to its lower alkalinity and different chemical action.
Additionally, substituting borax for washing soda may result in less effective stain removal on oily or greasy fabrics, since washing soda breaks down such soils more aggressively. However, borax offers benefits that washing soda doesn’t, including odor control and the inhibition of bacteria and fungi, which can be useful in laundering towels or musty clothing. For best results, some people use both compounds together to leverage their complementary strengths in a laundry routine.
Are washing soda and borax safe for septic systems?
Both washing soda and borax are generally considered safe for septic systems when used in typical household cleaning amounts. Washing soda dissolves completely in water and doesn’t introduce harmful residues, though its high alkalinity could slightly affect microbial balance in extreme overuse. However, the human body naturally expels alkaline waste, and septic tanks are designed to handle moderate pH variations, so occasional use poses little risk.
Borax is also safe for septic systems in normal laundry and cleaning applications. It doesn’t contain phosphates or surfactants that could disrupt the bacterial ecosystem responsible for breaking down waste. Still, excessive or frequent use might lead to boron buildup, which, in very high concentrations, could potentially affect plant life if septic effluent is used for irrigation. For both products, following recommended usage guidelines ensures safe operation with septic tanks.
Can washing soda and borax be used together?
Yes, washing soda and borax can be used together safely, and many homemade cleaning and laundry recipes combine the two for enhanced effectiveness. Each has unique chemical properties that complement the other: washing soda boosts the pH and softens water aggressively, while borax stabilizes enzymes in detergents, inhibits microbial growth, and aids in suspending dirt particles in water. Together, they create a powerful cleaning duo, especially useful in areas with hard water.
A common mixture includes one part washing soda, one part borax, and one part grated soap (like Castile) to form a DIY laundry detergent powder. This blend helps remove stubborn stains and improves detergent efficiency while keeping costs low. Although both are safe when mixed, caution is advised during handling—using gloves and avoiding inhalation of dust is recommended due to their alkaline nature and potential irritation to skin and respiratory passages.
Do washing soda and borax kill mold and mildew?
Washing soda can help manage mold and mildew by altering the pH of surfaces, making the environment less hospitable for fungal growth, but it is not classified as a disinfectant or fungicide. Its high alkalinity can loosen mold residue and prepare surfaces for cleaning, making it useful as a pre-treatment. However, it does not actively kill mold spores, particularly on porous surfaces like drywall or wood, where deep penetration is required.
In contrast, borax is known for its mild antifungal and antibacterial properties and is often used specifically to treat mold. When applied as a solution (typically 1 cup of borax per gallon of water), it can kill mold on contact and prevent regrowth due to residual boron left on surfaces. Borax is particularly effective on non-porous areas like tile or glass. For mold remediation, borax is the more appropriate choice, while washing soda is better suited for general cleaning and degreasing tasks.
Are washing soda and borax safe to use around children and pets?
Both washing soda and borax should be used with caution around children and pets due to their potential irritant properties. Washing soda, with its high pH, can cause skin and eye irritation upon direct contact and may be harmful if ingested in large quantities. It’s important to store it securely and rinse cleaned surfaces thoroughly, especially floors or toys that could be mouthed by children or pets.
Similarly, borax is considered low in toxicity but can pose health risks if ingested or inhaled in significant amounts. The Environmental Protection Agency (EPA) advises against direct or prolonged exposure, particularly for small children or pets. While both substances are natural and degrade over time, they are not meant for consumption, and proper storage in labeled, sealed containers is essential to ensure household safety.
Can I use washing soda or borax for cleaning dishes?
Washing soda is not recommended for hand-washing dishes because of its high alkalinity, which can be harsh on the skin and may leave residues if not thoroughly rinsed. While it is sometimes found in automatic dishwasher detergents due to its water-softening and grease-cutting abilities, using it directly in hand dishwashing can cause dryness or irritation. Additionally, improper rinsing could leave a soapy or alkaline film on dishes, making them unsafe for food contact.
Borax can be used in dishwashing, but primarily in dishwasher machines rather than by hand. It helps soften water and boosts cleaning power when combined with other detergents. However, because borax is not designed as a standalone dish cleaner and may not fully dissolve in cooler water, it should not replace regular dish soap. For handwashing, mild, food-safe detergents are safer and more effective options, while borax additions in automatic systems should follow manufacturer guidelines to avoid buildup or residue.