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Standard XII

Chemistry

Normality

Find the amou...

Question

Find the amount of $98 %$ pure $N a_{2} C O_{3}$ required to prepare 5 litres of 2 N solution.

54.8 g impure

N a_{2} C O_{3}

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540.8 g impure

N a_{2} C O_{3}

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40.8 g impure

N a_{2} C O_{3}

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340.8 g impure

N a_{2} C O_{3}

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Solution

The correct option is B 540.8 g impure $N a_{2} C O_{3}$
no. of equivalents = normality $\times$ volume
=5 $\times 2$ =10
Also, no. of equivalents = $\frac{w e i g h t}{e q u i v a l e n t w e i g h t}$
Therefore, $\frac{w e i g h t \times 2}{m o l e c u l a r w e i g h t}$ =10....... [n factor for Na $_{2} C O_{3}$ =2]
Weight =5x molecular weight = 5x 106 =530
Sample is 98% pure
amount required = $\frac{530 \times 100}{98}$ =540.8g impure Na $_{2} C O_{3}$

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Similar questions

21.2 g

sample of impure

N a_{2} C O_{3}

is dissolved and reacted with a solution of

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, the weight of

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. Which of the following statements is/are correct?

21.2 g

sample of impure

N a_{2} C O_{3}

is dissolved and reacted with a solution of

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21.2 g

sample of impure

N a_{2} C O_{3}

is dissolved and reacted with a solution of

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21.2 g

sample of impure

N a_{2} C O_{3}

is dissolved and reacted with a solution of

C a C l_{2}

, the weight of precipitate of

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. Which of the following statements is/are correct ?

6.2

g of a sample containing

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Find the amount of $98 %$ pure $N a_{2} C O_{3}$ required to prepare 5 litres of 2 N solution.