Inorganic phosphate
= Inorganic phosphate
{title2=$\mathrm P_i$}
<Inorganic phosphate>, abbreviated $\mathrm P_i$, denotes the free <phosphate> pool in biochemical <chemical equations>, including <ATP> <hydrolysis>. Its constituent <chemical species> depend on <pH> and <protonation>; $\mathrm P_i$ does not specify a single <electric charge> or proton count. See the https://iubmb.qmul.ac.uk/thermod2/[IUBMB recommendations on biochemical reactant pools].