The pH of a solution is a measure of its acidity or alkalinity.

Question

Specifically, pH=−log⁡[H+] where [H+] is the hydrogen ion concentration in moles per liter. A solution with a pH less than 7 is an acid, one with a pH greater than 7 is a base (alkaline) and a pH of 7 is regarded as neutral.

a. The hydrogen ion concentration of pure water is [H+]=10^(−7). Find its pH.

b. Find the pH of a solution with [H+]=6.3×10^(−13).

c. The pH of gastric acid (the acid in your stomach) is about 0.7. What is the corresponding hydrogen ion concentration?

(when answering pls label the variables (1,2,3.. or a,b,c...) when writing the answers, THANK YOU)

Answer 1

(a) pH = - log [H+] = -log 10^-7 = --7 = 7

(b) -log (6.3 x 10^-13) = 12.2

(c) - log [H+] = 0.7

log [H+] = -0.7

[H+] = 10 ^ -0.7 = 0.1995 moles per liter