The oxidation state of phosphorus in cyclotrimetaphosphoric acid () is: — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

The structure consists of a $(P-O)_3$ ring. Each $P$ atom is bonded to two ring oxygens and two external oxygens (one $=O$ and one $-OH$). <br>Calculation: $3(+1) + 3x + 9(-2) = 0 \Rightarrow 3x = 15 \Rightarrow x = +5$. [1]