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Preparations and Uses of Sodium Carbonate

The addition ...

Question

The addition of solid sodium carbonate to pure water causes

A

An increase in hydronium ion concentration

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B

An increase in alkalinity

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C

No change in acidity

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D

A decrease in hydroxide ion concentration

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Solution

The correct option is B
An increase in alkalinity

Adding $N a_{2} C O_{3}$ to water makes the solution basic and hence pH increases more than 7.

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Q. Assertion :If an acid is added to water with original pH of

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, the concentration of hydroxide ions will increase. Reason: The product of hydroxide ions and hydrogen ions is equal to

1.0 \times

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Q. Assertion :In the precipitation of the iron group in quantitative analysis, ammonium chloride is added before adding ammonium hydroxide to decrease a concentration of hydroxide ions. Reason: Addition of ammonium ions decreases the concentration of hydroxide ions in the concerned solution of above statement, following the law of ionic equilibrium.

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. The hydroxide ion concentration in the same solution is:

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Preparations and Uses of Sodium Carbonate

Standard XII Chemistry

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