We’re being asked to calculate the pH of a pH of a solution formed by mixing 100.0 mL of 0.100 M NaF and 100.0 mL of 0.060 M HCl.
NaF is a salt and it will break up in the solution:
NaF → Na+(aq) + F-(aq)
F- is a conjugate base and of a weak acid (HF):
HF + H2O(l) → F-(aq) + H3O+(aq)
(weak acid) (conjugate base)
HCl will react with F-:
Reaction: NaF(aq) + HCl(aq) → HF(aq) + NaCl(aq)
We will calculate the pH of the solution using the following steps:
Calculate the pH of a solution formed by mixing 100.0 mL of 0.100 M NaF and 100.0 mL of 0.060 M HCl. Ka of HF = 7.24 x 10-4.
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