The e.m.f of cell in V: H₂(g) |Buffer || Normal caloal electrode is 0.6885 V at 40°C when the barometric pressure is 725 mm of

Question

The e.m.f of cell in V: H₂(g) |Buffer || Normal caloal electrode is 0.6885 V at 40°C when the barometric pressure is 725 mm of Hg. What is the pH of the solution. E = 0.28 .(write the value to the nearest integer)

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