calculate the equivalent weight of H3PO4 and Ca(OH)2 on the basis of given reaction.
H3PO4+NaOH gives NaH2PO4+H2O
Ca(OH)2 +HCl gives Ca(OH)Cl+H2O
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An equivalent weight of a solution is defined as the molecular weight of the solute divided by the valence of the solute. Equivalent weight is used for predicting the mass of a substance that reacts with one atom of hydrogen in an acid-base analysis like in titration.
The given reaction is:
Ca(OH)2 + H3PO4 → CaHPO4 + 2H2O
In the reaction,
H3PO4 → HPO42- + 2H+
2 hydrogen ions are left from the orthophosphoric acid.
Therefore, the valency factor = 2
Equivalentweight=molecularweight2
Molecular weight calculation.
Number of H are 3
3 × 1 = 3
Number of P is 1
1 × 31 = 31
Number of O are 4
4 × 16 = 64
Molecular weight = 3 + 31 + 64
Molecular weight = 98
Therefore, the equivalent weight = (98/2) = 49
Equivalent weight of H3PO4 is 49.
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