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Soapmakers measure the acidity or alkalinity of bath soap by its pH level on a scale of 0 (acidic) to 14 (alkaline). Substances at either end of the scale, such as sulfuric acid and lye, are harmful to skin.

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The high pH in soap is typically due to the presence of alkaline substances such as sodium hydroxide or potassium hydroxide during the soap-making process. These substances help in saponification, the reaction that converts fats and oils into soap, resulting in a product with a pH level that is higher than neutral.

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10mo ago
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Q: What makes the pH in soap high?
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