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Question

The equivalent weight of NaH2PO4 in the following reaction is:

NaOH+H3PO4NaH2PO4+H2O

A
96
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B
100
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C
120
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D
98
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Solution

The correct option is B 120
An equivalent weight of an acid is the ratio of the molecular weight to the number of replaceable H atoms. In the reaction, only one H atom of phosphoric acid is displaced. Hence, the equivalent weight is equal to molecular weight which is 120 g/mol of hydrogen (atomic weight of phosphorus =31).

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