What is the pH of a 4*10^-2 M HCl solution?

1 Answer
anor277
Apr 27, 2016

pH = -log_(10)[H_3O^+] = -log_(10)(4.0xx10^-2) = 1.40

Explanation:

pH = -log_(10)[H_3O^+] = -log_(10)(4.0xx10^-2)

We assume (reasonably) that hydrochloric acid will undergo complete dissociation in water to give stoichiometric H_3O^+ ion, according to the given reaction:

HCl(aq) + H_2O(l) rarr H_3O^(+) + Cl^-

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