1.

One mole of ammonia was completely absorbed in one litre solution each of (a) 1 M HCI, (b) 1 MCH_3COOH and (c) 1 M H_2SO_4 at 298 K. The decreasing order for the pH of the resulting solution is (Given K_(b) (NH_3) = 4.74)

Answer»

`b GT c gt a `
`a gt b gt c `
`b gt a gt c `
`c gt b gt a `

Solution :a) `NH_3 + HCL to NH_4Cl`
1M of `NH_3` completely reacts with 1M HCl. The SALT formed is ACIDIC
b) `CH_3COOH + NH_3 to CH_3COO NH_4`. The salt formed is neutral
c) `2NH_3 + H_2SO_4 to (NH_4)_2 SO_4 `. 1 M of `NH_3` need 0.5 M of `H_2SO_4 `, 0.5 M still REMAIN in solution.
The salt is acidic.


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