Question

How will you distinguish NH4OH solution from NaOH solution?

Answer 1

Answer:

NH4OH and NaOH can be distinguished by using calcium salts. For example on adding NaOH to Ca(NO3)2, Ca(OH)2 is obtained as white precipitate which is sparingly soluble in excess of NaOH. On addition of NH4OH to calcium salts, no precipitation of Ca(OH)2 occurs even with the addition of excess of NH4OH.

using calcium salts.

Answer 2

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How will you distinguish NH4OH solution from NaOH solution?

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NH4OH and NaOH can be distinguished by using calcium salts.

For example, on adding NaOH to Ca(NO3)2, Ca(OH)2 is obtained as white precipitate which is sparingly soluble in excess of NaOH.

Ca(NO3)2 + 2NaOH → Ca(OH)2 + 2NaNO3

On addition of NH4OH to calcium salts, no precipitation of Ca(OH)2 occurs even with the addition of excess of NH4OH.This is because the concentration of OH- ions from the ionization of NH4OH is so low that it cannot precipitate the hydroxide of calcium.

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