Questions tagged [soap]

Soap is a salt of fatty acid used generally for cleansing purposes. For questions relating to soap or saponification.

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Where do the chloride ions go during saponification precipitation?

During saponification hydroxide ions from the lye join to the triglyceride to form glycerol, and the sodium bonds with the fatty acids making the soap molecules. However, it is sometimes the case that ...
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886 views

Quantifying soapiness; there's pH, pKa and pO2, is there a p_soap or p_surfactance?

Yes, $\mathrm{pH}$ is a concentration, $\mathrm{p}K_\mathrm{a}$ is a dissociation constant, and $\mathrm{pO_2}$ is a partial pressure. These are (roughly speaking) ways to indicate how much of a key ...
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What caused a colour change when I mixed two different dish soaps?

I recently purchased "organic" dish soap refill made from saponified coconut oil and potassium soap (full ingredient list). Instead of waiting for the old dish soap (Dawn) to be completely ...
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1answer
36 views

Three Phases in TFM test instead of two

I am currently trying to perform the Total Fatty Matter (TFM) test on soap and for some reason I am getting three phases instead of two. The surfactant used is SLES and other reagents include hot ...
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Reason for three phases in total fatty matter test on soap [duplicate]

I am currently trying to perform the Total Fatty Matter (TFM) test on soap and for some reason I am getting three phases instead of two. The surfactant used is SLES and other reagents include hot ...
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1answer
128 views

Is Sodium Laurate (SL) the same as Sodium Lauryl Sulfate (SLS) and Sodium Laureth Sulfate (SLES)? [closed]

Is Sodium Laurate (SL) the same as Sodium Lauryl Sulfate (SLS) and Sodium Laureth Sulfate (SLES)? There's controversy surrounding using SLS and SLES ingredients due to possible carcinogens. However, ...
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69 views

Substituting K2CO3 for KOH in Soap

Wood water obtained by running water through hardwood ashes has a high quantity of $\ce{K2CO3}$, historicaly this was called lye. Yet soap recipes today seem to use $\ce{KOH}$ or $\ce{NaOH}$ as lye. $...
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Saponification - Oil and Alcohol?

I've been reading that a saponification reaction typically involves NaOH or KOH. I was wondering - could anything that contains an OH group cause a saponification reaction? For instance, coconut oil + ...
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0answers
32 views

How can a detergent "designed for sensitive skin" warrant the "corrosive" hazard symbol?

The dish-washing detergent, which you can find an image of here, has the following hazard symbol on its back: On the back, it additionally says that if it comes in contact with the skin, you should ...
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1answer
87 views

What is the chemical formula(s) for liquid potassium-based soap? [closed]

Many places say that liquid soap is generally potassium-based, while the solid stuff is sodium-based. But, while I have found several sites saying that solid soap is usually sodium stearate, I can't ...
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44 views

How to remove the water from soap

I find when making soap that a difficult part is removing the water. Currently what I do is melt the soap and then put the melted soap into a vacuum chamber. This draws the water out by vacuum. You ...
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How do I remove some of the glycerin when making soap?

In some older descriptions of soap making, I read that when the base is added to the fat the glycerin separates and collects at the top where it is drained off. Fine, but there are no details. In ...