Determine the ph of a buffer solution comprised of a 1.41 m hf and 0.623 m naf. the ka of hf = 7.20 x 10-4

Question

Chemistry

Yurem Phelps

6 May, 23:21

Determine the ph of a buffer solution comprised of a 1.41 m hf and 0.623 m naf. the ka of hf = 7.20 x 10-4

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Reece Marquez · Answer 1

we are going to use H-H equation:

PH = Pka + log[conjugate base]/[weak acid]

when we have here the conjugate base is NaF

and the weak acid is HF.

so, we are going to use the Ka value to get the value of Pka.

when Pka = - logKa

= - log7.2 X 10^-4

= 3.14

then we will substitution on H-H equation:

∴ PH = 3.14 + log (0.623) / (1.41) = 2.99