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At what pH will a 1.0 xx 10^(-3)M soluti...

At what `pH` will a `1.0 xx 10^(-3)M` solution of an indicator with `K_(b) = 1.0 xx 10^(-10)` changes colour?

A

`10`

B

`4.0`

C

`3`

D

`7`

Text Solution

Verified by Experts

The correct Answer is:
B
An acid base indicator changes its colour when `pH = pK_(a) or pOH = pK_(b)`.
`:. K_(b) = 10^(-10), pK_(b) = 10`
`:. pOH = 10, pH = 14 - 10 = 4`
`pH = 4`
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