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How do you calculate the pH of a formic acid solution that contains 1.41% formic acid by mass? (density=1.01g/mL)
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- 1 decade agoFavorite Answer
Assume 1 litre of solution.
D=1.01g/ml so mass of formic acid = 1000ml * 1.01g/ml * 1.41% = 14.241g.
moles of formic acid = 14.241g / 46.03g/mol = 0.309mol
Formic acid has 1 acidic proton, and assuming complete ionization [H+] = 0.309M
pH = -log[H+] = 0.51
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