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Which excess of NaOH solution is added i...

Which excess of `NaOH` solution is added in potash alum the product is.

A

A bluish precipitate

B

Clear solution

C

White precipitate

D

Greenish precipitate

Text Solution

Verified by Experts

The correct Answer is:
B
Potash alum is `K_(2)SO_(4).Al_(2)(SO_(4))_(3).24 H_(2) O`.
`Al_(2)(SO_(4))_(3)` reacts with `NaOH` to form `NaAlO_(2)` which is soluble. `K_(2)SO_(4)` and `Na_(2)SO_(4)` are also soluble and thus a clear solution is obtained in water.
`Al_(2)(SO_(4))_(3) +6NaOH rarr 2Al(OH)_(3) +3 Na_(2)SO_(4)`
`Al(OH)_(3) +NaOH rarr underset("Soluble")(NaAlO_(2)) + 2H_(2)O`.
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