pBlock ElementsII 1 Question 90
86. Complete and balance the following reactions. (1994, 1M)
$$ \begin{aligned} & \mathrm{Ca}{5}\left(\mathrm{PO}{4}\right){3} \mathrm{~F}+\mathrm{H}{2} \mathrm{SO}{4}+\mathrm{H}{2} \mathrm{O} \xrightarrow{\text { Heat }} \ & \ldots+5 \mathrm{CaSO}{4} \cdot 2 \mathrm{H}{2} \mathrm{O}+\ldots \end{aligned} $$
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Solution:
- $\mathrm{Ca}{5}\left(\mathrm{PO}{4}\right){3} \mathrm{~F}+5 \mathrm{H}{2} \mathrm{SO}{4}+10 \mathrm{H}{2} \mathrm{O} \xrightarrow{\text { Heat }} 3 \mathrm{H}{3} \mathrm{PO}{4}$
$$ +5 \mathrm{CaSO}{4} \cdot 2 \mathrm{H}{2} \mathrm{O}+\mathrm{HF} $$
