Baking soda soap combines sodium carbonate with oils to create a gentle, non-toxic cleansing bar. If you’re wondering how to make baking soda soap at home, this guide will walk you through every step with simple, clear instructions.
Making your own soap is a rewarding way to control ingredients and avoid harsh chemicals. Baking soda adds a mild exfoliating texture and helps neutralize odors. You don’t need special equipment, just basic kitchen tools and patience.
This article covers everything from safety to curing. You’ll learn the science behind baking soda soap, the best oils to use, and how to avoid common mistakes. Let’s get started.
What Is Baking Soda Soap?
Baking soda soap is a cold-process soap that includes sodium bicarbonate (baking soda) as an additive. Unlike commercial bars, it’s free from synthetic fragrances and detergents.
The baking soda acts as a gentle abrasive, making it great for exfoliating dead skin. It also helps balance pH levels, which can be soothing for sensitive skin.
Many people use baking soda soap for acne, body odor, or just a natural clean. It’s a versatile bar that works for face, hands, and body.
Why Use Baking Soda In Soap?
Baking soda offers several benefits in homemade soap:
- Mild exfoliation without scratching
- Odor neutralizing properties
- Helps create a harder, longer-lasting bar
- Can soothe itchy or irritated skin
- Non-toxic and biodegradable
However, too much baking soda can make the soap crumbly. You’ll need to balance it with the right oils and lye concentration.
How To Make Baking Soda Soap
Now for the main event. Follow these steps carefully to create your own batch of baking soda soap.
Safety First: Handling Lye
Lye (sodium hydroxide) is caustic and must be handled with care. Always wear gloves, goggles, and long sleeves. Work in a well-ventilated area, away from children and pets.
Never add water to lye; always add lye to water slowly. The mixture will heat up quickly, so use a heat-safe container like a stainless steel or glass bowl.
If you get lye on your skin, rinse with vinegar then water. Keep a bottle of vinegar nearby just in case.
Ingredients You’ll Need
For a basic batch of about 2 pounds of soap, gather these ingredients:
- 10 ounces distilled water
- 4 ounces sodium hydroxide (lye)
- 20 ounces olive oil
- 10 ounces coconut oil
- 5 ounces shea butter
- 2 tablespoons baking soda (sifted)
- Optional: essential oils for fragrance
Use a digital scale for accuracy. Soap making is a science, so don’t guess measurements.
Step-By-Step Instructions
Follow these numbered steps carefully. Take your time, especially if this is your first batch.
- Prepare your workspace. Cover your counter with newspaper or a silicone mat. Have all tools ready: stick blender, thermometer, spatula, and soap mold.
- Mix lye solution. In a well-ventilated area, slowly pour lye into water while stirring. Do not inhale fumes. Set aside to cool to about 100-110°F.
- Melt oils and butters. In a large pot, combine olive oil, coconut oil, and shea butter. Heat gently until melted, then remove from heat. Let cool to around 100-110°F.
- Combine lye and oils. Slowly pour the lye solution into the melted oils. Use a stick blender to mix. Blend in short bursts until you reach “trace” — when the mixture thickens like pudding.
- Add baking soda. Sift the baking soda into the soap batter. Stir gently with a spatula to avoid clumps. If using essential oils, add them now.
- Pour into mold. Quickly pour the batter into your soap mold. Tap the mold on the counter to release air bubbles. Smooth the top with a spatula.
- Insulate and cure. Cover the mold with a towel or cardboard. Let it sit for 24-48 hours. Then unmold and cut into bars. Cure on a rack for 4-6 weeks.
During curing, the soap hardens and the pH becomes safe for skin. Do not use before 4 weeks.
Tips For Success
Here are some practical tips to avoid problems:
- Use a silicone mold for easy release
- If the soap seizes (gets too thick fast), work quickly
- Baking soda can cause a slight color change; that’s normal
- Test pH with a strip after curing; it should be around 9-10
- Store soap in a cool, dry place
Common Mistakes And How To Fix Them
Even experienced soap makers run into issues. Here are frequent problems and solutions.
Soap Is Too Crumbly
If your soap crumbles when cut, you likely used too much baking soda or not enough water. Reduce baking soda to 1 tablespoon per pound of oils next time. Also check your lye concentration.
Soap Has White Spots
White spots are usually undissolved baking soda or lye crystals. Always sift baking soda and mix lye thoroughly. Stir the batter well before pouring.
Soap Doesn’t Harden
If your soap stays soft after 48 hours, the recipe may have too much soft oil (like olive oil) or not enough hard oils. Increase coconut oil or add palm oil for a harder bar.
Soap Has A Strange Smell
Baking soda can react with some oils, creating a faint ammonia-like smell. This usually fades during curing. If it persists, try a different oil blend next time.
Variations And Add-Ins
Once you master the basic recipe, experiment with these variations.
Herbal Baking Soda Soap
Add dried herbs like lavender, chamomile, or rosemary. Infuse the oils with herbs first for extra benefits. Use about 1 tablespoon of dried herbs per pound of soap.
Exfoliating Baking Soda Soap
Mix in ground oatmeal, poppy seeds, or coffee grounds along with baking soda. This creates a scrubby bar for rough skin. Keep total additives under 2 tablespoons per pound.
Fragrant Baking Soda Soap
Use essential oils like tea tree, peppermint, or lavender. Add them at trace, about 0.5 to 1 ounce per pound of oils. Avoid citrus oils as they can cause discoloration.
Frequently Asked Questions
Here are common questions about making baking soda soap.
Can I use baking soda instead of lye?
No. Baking soda cannot replace lye. Lye is needed for saponification — the chemical reaction that turns oils into soap. Baking soda is just an additive.
Is baking soda soap safe for sensitive skin?
Yes, if formulated correctly. Too much baking soda can be drying, but a small amount (1-2 tablespoons per pound of oils) is gentle. Test on a small area first.
How long does baking soda soap last?
Properly cured soap lasts 6-12 months. Store it in a dry place away from direct sunlight. Use a draining soap dish to extend its life.
Can I use baking soda in melt and pour soap?
Yes, but it’s tricky. Baking soda can cause melt and pour soap to become grainy or separate. Add it at the very end and stir gently. Use only 1 teaspoon per pound of base.
Why is my baking soda soap turning brown?
Browning can happen from vanilla in essential oils or from overheating during saponification. Keep the soap cool during the process and avoid vanilla-based fragrances.
Final Thoughts On Making Baking Soda Soap
Making baking soda soap is a fun and practical skill. You get full control over ingredients, and the result is a gentle, effective bar for everyday use.
Start with the basic recipe above. Once you’re comfortable, try different oils, scents, and add-ins. Keep notes on each batch so you can replicate successes.
Remember to always prioritize safety with lye. Cure your soap patiently for the best results. With practice, you’ll be making beautiful, functional bars that rival store-bought options.
Now you have all the information you need to start. Gather your ingredients, set up your workspace, and enjoy the process of creating something truly handmade.