For the precipitation of cations of group four in the qualitative analysis, the medium is made alkaline before passing `H_(2)S` gas. The purpose of al

Question

For the precipitation of cations of group four in the qualitative analysis, the medium is made alkaline before passing `H_(2)S` gas. The purpose of al

For the precipitation of cations of group four in the qualitative analysis, the medium is made alkaline before passing `H_(2)S` gas. The purpose of alkaline solution is
A. to supress the ionisation of `H_(2)S`
B. to increase the ionisation of `H_(2)S`
C. to increase the ionisation of metal salt
D. to decrease the ionisation of metal salt.

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 - B
`H_(2)S hArr 2H^(+) +S^(-2)`
`NH_(4)OH rarr NH_(4)^(+) +OH^(-)`
`H^(+)` combines with `OH^(-)` to form water and thus the first equilibrium shifts in the forward direction to increase the ionisation of `H_(2)S`.

4 views Answered 2023-02-05 15:29