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.
The pH level of cinthol soap is 9.5.
The pH of Ivory dish soap is around 9-10, which makes it slightly alkaline. This pH level helps to break down grease and oils effectively.
9
Dawn Ultra Concentrated Antibacterial Hand Soap and Dish Washing liquid has a pH of 9. Ivory Dish Soap from the same manufacturer has a pH of 7.4. Soap naturally has a high pH, but many commercial soaps have buffers to normalize the ph. This is how some soaps keep from burning eyes and making people break out in rashes. Industrial soaps use the same trick to keep from reacting with metals.
The pH level of Dove soap is around 7, which is considered neutral. This makes it gentle on the skin and less likely to cause irritation or dryness compared to soaps with higher pH levels.