The acetic acid solution is 1.49 x 10 -3 ± 4 x 10 -5 M. Report...

Question

Question

The acetic acid solution is 1.49 x 10 -3 ± 4 x 10 -5 M. Report the pH of this solution and its uncertainty

Answer 1

Answer #1

As dissociation of acetic acid will give ,CH₃COO^- and H⁺

Hence its pH = - log (H+)

pH = - log (1.49 x 10 ^-3) = - log(1.49) - log 10 ^-3 = -0.1731 + 3 = 2.82

*For y = log (a ±S(a)), uncertainty in y i.e .S(y) = 0.434*(S(a)/a)

Hence,

uncertainty in pH will be 0.434 *(1.49 x 10 -3 /4 x 10 -5) = .01165

Hence,

pH of solution with uncertainty = 2.82 ± 0.01165

Answer 2

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