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  4. For a very dilute aqueous solution of H3PO3 van't Hoff factor

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Q. For a very dilute aqueous solution of $H_3PO_3$ van't Hoff factor

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Solution:

$H _3 PO _3$ ionises in water as
$H _3 PO _3 \rightleftharpoons 2 H ^{+}+ HPO _3^{2-}$
$\therefore i =3$