Calculate the equivalent weight of phosphoric acid [for reaction that replace all three(3) hydrogen ions]
"3NaOH + H_3PO_4 \\to 3H_2O + Na_3PO_4"
The above is an example of a reaction where phosphoric acid loses all three protons.
Equivalent weight of an acid = "\\dfrac{\\textsf{Molecular weight of acid}}{\\textsf{Basicity of acid}}"
molecular weight of phosphoric acid = 98
"\\therefore" Its Equivalent weight = "\\dfrac{98}3" = 32.67
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