First slide

Ionization constants of weak acids, PH of weak acids

Question

The successive dissociation constants Ka₁ , Ka₂ and Ka₃of ortho phosphorous acid (H₃PO₃) are

Easy

A

$\large 7\, \times \,{10^{ - 7}},\,1.6\, \times {10^{ - 2}},\,0$
B

$1.6\, \times \,{10^{ - 2}},\,\,7\, \times {10^{ - 7}},\,0$
C

$1.6\, \times \,{10^{ - 2}},\,\,7\, \times {10^{ - 7}},\,\,\,1 \times {10^{ - 2}}$
D

$1\, \times \,{10^{ - 12}},\,\,7\, \times {10^{ - 7}},\,\,\,1.6 \times {10^{ - 2}}$

Solution

The number of acidic Hydrogens (basicity) present in ortho-phosphorous acid = 2
Sucessive dissociation constants always decreases for poly protic acid.

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