ElectrochemistryMedium

Question

An electrochemical cell is set up as follows: Pt|H2(g) (1 atm)|0.001 M HCl||0.1 M HA|H2(g) (1 atm)|Pt EMF of this cell is zero because (pKa of HA = 5)

Options

A.molar concentrations of acids are different
B.Temperature is constant
C.pH of two solutions are same
D.both are standard hydrogen electrodes

Solution

$\left\lbrack H^{+} \right\rbrack_{HA} = \sqrt{K_{a}.C} = \sqrt{10^{- 5} \times 0.1} = 10^{- 3}\text{ M}$

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