17. Double circuit type
(-) Pt, H2 | S || KCl aq. | Hg2Cl2, Hg ( )
P=1 C=0.1M
S is a) a phosphate buffer solution with a pH of 6.86; b) solution with unknown pH. The EMF of the circuits at 298K was:
a) 0.7409V; b) 0.609V. Find the pH.

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