Not all soaps have exactly the same pH, however in general, they would have a pH higher than 7. A pH of 9 is possible.
The pH of soap typically falls within the range of 8 to 10, so it would be more accurate to say that the pH of soap is closer to 9 than to 4. However, the pH can vary depending on the specific formulation and ingredients of the soap.
4.6667
pH means -log10(H+concentration) so pH of a H+ concentration 3.6x10-9 is: pH = -log10(3.6x10-9) ≈ 8.4
solution with [OH-] = 2.5 x 10-9 , A solution with [H+] = 1.2 x 10-4, A solution with pH = 4.5
take the negative logarithm ex. 10^-4 has a pH of 4
-log[1 X 10^-4 M OH(-)] = 4 14 - 4 = 10 pH ----------------
9
9
9
"Soap" is not a single thing, there are lots of different kinds of soap. That said, if you told me that a particular soap had a pH of 9 I'd be a lot more inclined to believe you had some idea of what you were talking about than if you said it had a pH of 4.
True soap (fats reacted with lye) is slightly alkaline. A pH of 4 is acid, a pH of 9 is alkaline. You can probably figure it out now. However many "soaps" on the market are really detergents, which tend to be closer to neutral (pH 7).
9
The pH level of cinthol soap is 9.5.
9 to 10
9
pH 9 - pH 4 = pH 5 It is stronger by 5 pH.
Tomato juice is acidic, soap is basic.
Tomato juice is acidic, soap is basic.