Balance the following equations.
(i) `H_(3)PO_(3) to H_(3)PO_(4) + PH_(3)`
(ii) `Ca + H_(2)O to Ca(OH)_(2) + H_(2)`
(iii) `Fe_(2)(SO_(4))_(3) + NH_(3) +H_(2)O to Fe(OH)_(3) + (NH_(4))_(2)SO_(4)`

Explanation

To balance the given chemical equations, we will follow a systematic approach for each reaction.

### (i) Balancing the equation:
**H₃PO₃ → H₃PO₄ + PH₃**

1. **Count the atoms of each element on both sides:**
- Reactants: H = 3, P = 1, O = 3
- Products: H = 3 (from H₃PO₄) + 3 (from PH₃) = 6, P = 1 (from H₃PO₄) + 1 (from PH₃) = 2, O = 4
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