Question
Assign oxidation number to the underlined elements in the following species:
NaH2PO4
✓
Answer
Let the oxidation number of P be x. We know that, Oxidation number of Na = +1 Oxidation number of H = +1 Oxidation number of O = -2 $\begin{matrix}\ \ +1&+1&\text{x}&-2\\\Rightarrow\ \text{Na}& \ \ \text{ H}_2 &\text{P}&\ \text{ O}_4\end{matrix}$ Then, we have 1(+1) + 2(+1) + 1(x) + 4(-2) = 0 ⇒ 1 + 2 + x - 8 = 0 ⇒ x = +5
Hence, the oxidation number of P is +5.
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