Q.

The equivalent weight of NaOH in the following reaction  2 NaOH + H3PO Na2HPO4 + 2H2O [M = Mol.wt of NaOH] is

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a

M/2

b

M/1

c

M/3

d

M/4

answer is B.

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Detailed Solution

The equivalent mass of NaOH is calculated based on the amount of hydroxide ions (OH) it provides in a given chemical reaction. In the reaction:

2 NaOH + H3PO4 → Na2HPO4 + 2 H2O

Each molecule of NaOH contributes one hydroxide ion (OH) to the reaction. The reaction involves two moles of NaOH reacting with one mole of phosphoric acid (H3PO4) to form one mole of disodium hydrogen phosphate (Na2HPO4) and two moles of water.

To determine the equivalent mass of NaOH in this specific reaction, we use the formula:

Equivalent mass = Molar mass of NaOH ÷ Number of OH ions donated per molecule

Since one molecule of NaOH releases one hydroxide ion (OH) in the reaction, the equivalent mass of NaOH equals its molar mass. Thus:

Equivalent mass of NaOH = Molar mass of NaOH (M)

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