Phosphorus has the oxidation state of +3 in: — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

1. Orthophosphoric acid ($H_3PO_4$): $3(+1) + x + 4(-2) = 0 \Rightarrow x = +5$. <br>2. Phosphorus acid ($H_3PO_3$): $3(+1) + x + 3(-2) = 0 \Rightarrow x = +3$. <br>3. Metaphosphoric acid ($HPO_3$): $1 + x + 3(-2) = 0 \Rightarrow x = +5$. <br>4. Pyrophosphoric acid ($H_4P_2O_7$): $4(+1) + 2x + 7(-2) = 0 \Rightarrow 2x = 10 \Rightarrow x = +5$. [1-34]