The molar ionic conductivities of `NH_(4)^(+) annd OH^(-)` at infinite dilution are 72 and 198 `ohm^(-1)cm^(2)`, respectively, the molar conductivity

Question

The molar ionic conductivities of `NH_(4)^(+) annd OH^(-)` at infinite dilution are 72 and 198 `ohm^(-1)cm^(2)`, respectively, the molar conductivity

The molar ionic conductivities of `NH_(4)^(+) annd OH^(-)` at infinite dilution are 72 and 198 `ohm^(-1)cm^(2)`, respectively, the molar conductivity of a centinormal `NH_(4)OH` solution aththe same temperature is found to be 9 `ohm^(-1)cm^(2)`. The percentage dissociation of `NH_(4)OH` at this concentration will be
A. `33%`
B. `7.14 %`
C. `12.5%`
D. `4.54 %`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - C
`Lambda^(@) (NH_(4)OH) = lambda_(NH_(4)^(+))^(@) + lambda_(OH^(-))^(@)`
`= 72 + 198 = 270 ohm^(-1) cm(2)`
`alpha = Lambda//Lambda^(@) = 9//270 = 1//30 = 0.0333`
`% alpha = 3.33 %`

4 views Answered 2023-02-05 15:29