Use of concentrated NaOH (lye or caustic soda) in soap preparations can produce
ID: 775308 • Letter: U
Question
Use of concentrated NaOH (lye or caustic soda) in soap preparations can produce a very basic product. A good soap tests between pH 7 and 9; pH 10 is rather harsh; a pH of 11 means something is wrong. How does a soap of a pH of 13 compare to the above values? how could you reduce the pH of the preparation? Use of concentrated NaOH (lye or caustic soda) in soap preparations can produce a very basic product. A good soap tests between pH 7 and 9; pH 10 is rather harsh; a pH of 11 means something is wrong. How does a soap of a pH of 13 compare to the above values? how could you reduce the pH of the preparation?Explanation / Answer
A soap with a pH of 13 is made with a NaOH extrastrong (very concentrated).
To reduce the pH of the preparation you can use a buffer solution to avoid abrupt changes on pH.
Diluting the NaOH on water (reducing the concentration) can be another possible solution.
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