61 Решение задачи по химии №006 130

14) For a concentration element consisting of metal A in electrolyte solutions B with concentrations m1 and m2 mol / 1000 g, calculate the EMF at 298 K. Calculate the activity by the average activity coefficient taken from the reference book or (for dilute solutions) by ionic strength. For a cell composed of a hydrogen electrode in an electrolyte solution C with a concentration of m3 mol/1000 g and a calomel half-cell with a KCI concentration of m4 mol/1000 g, calculate the EMF and pH of the solution containing electrolyte C. Do not take into account diffuse EMF. At 298 K, the standard potential of the calomel electrode (a(CI) = 1) is 0.2812 V, and the ion product of water is 1.008 * 10-14. Find the dissociation constants of weak electrolytes in the reference book.
Variant Substance m1 m2 С m3 m4 PH2, atm
A B
14 Ag AgNO3 1 0.5 HCOOH 0.1 0.7 2.0

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