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.
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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.
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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 ----------------