What is the hydrogen ion concentration of stomach acid (pH=2)?
Answer:
"Chemicals" is correct... pH is defined as -log [H+], so if pH = 2, the hydrogen ion concentration is 10^(-pH) = 10^(-2) = 0.01.
Egawwad is right that HCl, which comprises stomach acid, is a monoprotic acid, but it is not just >90% dissociated, it is 100% dissociated because this is the definition of a strong acid. However, we don't need to know this to solve the problem. The answer is not just close to 0.01, it IS 0.01.
pH is basically -log.
so the -log 2 = 10^-2
so the hydrogen ion concentration of stomach acid is 10^-2.
[H]~0.01mol
HCl is a monoprotic acid and ~ more than 90% dissociation
so 0.01 mol is so closed but not accurat
Approx. 10^-2 M
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