First slide

Basic Buffer

Question

A buffer solution is used in

Easy

A

preparation of potash alum
B

the removal of PO₄^-3 ions
C

increasing the pH value of a solution
D

precipitation of Cr(OH)₃ from CrCl₃

Solution

$M{g^{ + 2}} + PO_4^{ - 3} + {\left( {N{H_4}} \right)_2}C{O_3} + N{H_4}OH\xrightarrow{{}}\mathop {MgN{H_4}P{O_4}}\limits_{{\text{Insoluble}}} \downarrow$
The above reaction serves as a test to quality the presence of Mg⁺² in a salt sample.
The combinaiton (NH₄OH + (NH₄)₂CO₃) is a basic buffer.

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