Question

Isohydric solutions are the solutions having the same concentration of hydronium ion. If 0.2MHA (monobasic acid) solution is isohydric with 4×10−4MHCl solution, then Kb for A¯ is

Answer 1

Shout cut

Using formula

Ka×kb= kw

Ka= 4×10^-4

Kw of h2o = 10^-14 always

So

Kb= 10^-14/4×10^-4

So calculated this and get ans.

2.5×10^-10 and.

Answer 2

Kw of H2O =10^-14

Ka ×Kb =Kw

$\tt{}kb = \frac{0.2 \times {10}^{ - 14} }{4 \times {10}^{ - 4} }$

$\sf{kb \:o f \: {A}^{ - } = 1.25 \times {10}^{ - 8} }$