pBlock ElementsII 1 Question 112
109. Explain, “orthophosphoric acid, $\mathrm{H}{3} \mathrm{PO}{4}$ is tribasic but phosphorous acid, $\mathrm{H}{3} \mathrm{PO}{3}$ is dibasic”.
$(1982,1 \mathrm{M})$
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Solution:
- Orthophosphoric acid $\left(\mathrm{H}{3} \mathrm{PO}{4}\right)$ has three replaceable (acidic) hydrogen while orthophosphorus acid $\left(\mathrm{H}{3} \mathrm{PO}{3}\right)$ has only two replaceable hydrogen.
orthophosphoric acid (it has three acidic $\mathrm{H}$ )
