At `pH lt3.1`, the indicator methyl red is coloured red ,at `pH gt 6.3` , it is yellow and at the intermediate values of the `pH` ,it is orange .What
At `pH lt3.1`, the indicator methyl red is coloured red ,at `pH gt 6.3` , it is yellow and at the intermediate values of the `pH` ,it is orange .What will the colour of indicator be in a `0.1 M` solution of `NH_(4)Br`? Take `pK_(b)(NH_(4)OH)=4.74`.
A. Red
B. Yellow
C. Orange
D. `pH=3.1` so colour cannot be predicted
5 views
1 Answers
`NH_(4)Br rarr` Salt of `SAWB`
`pH=7-(1)/(2)pK_(b)-(1)/(2)logC=7-(4.74)/(2)log10^(-1)=7-2.37+(1)/(2)=5.13`
5 views
Answered