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Question

NaHCO3 solution is

A
weakly basic
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B
weakly acidic
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C
strongly basic
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D
strongly acidic
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Solution

The correct option is A weakly basic
The NaHCO3 solution is weakly basic. It gives yellow colour with methyl orange, but no colour with phenolphthalein.

Theory:
Properties of NaHCO3:

1. White crystalline solid, sparingly soluble in water.

2. The solution is alkaline in nature due to hydrolysis.
NaHCO3+H2ONaOH+H2CO3
The solution is weakly basic.

It gives yellow colour with methyl orange but no colour with phenolphthalein.

3. On heating, it loses CO2 and H2O forming Na2CO3
2NaHCO3ΔNa2CO2+CO2+H2O
NaHCO3 is known as baking soda because it decomposes on heating to generate bubbles of
CO2.

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