First slide

Ionization constants of weak acids, PH of weak acids

Question

The dissociation constants of monobasic acids A, B, C and D are $\large 1 \times {10^{ - 4}},\,1 \times {10^{ - 5}},\,\,1 \times {10^{ - 6}}\,\& \,1\, \times {10^{ - 10}}$ respectively. The pH values of their 0.1 molar aqueous solutions are in the order

Moderate

A

A < B < C < D
B

A > B > C > D
C

A = B = C = D
D

A > B < C > D

Solution

P^H of a solution of weak acid is given by,
P^H = $\frac{1}{2}[P^{K_a}-logC_0]$
$\because\;the\;concentration\;is\;same, P^{K_a}\;value\;will\;decide\;the\;P^H.$

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