Given the dissociation constants for each deprotonation, what is the dissociation constant for the overall reaction (Ka’’)? H3PO4 + H2O  H2PO4- + H3O+                     Ka = 7.11 x 10-3 H2PO4- + H2O  HPO42- + H3O+                           Ka’ = 6.32 x 10-8 Overall: H3PO4 + 2 H2O  HPO42- + 2 H3O+              Ka’’ = ?

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Diol

In chemistry there are so many chemical compounds that have a hydroxyl group but a chemical compound having two hydroxyl groups (-OH) is termed as a diol. It also implies the presence of two alcohols whereas polyols contain two or more than two hydroxyl groups (-OH). Glycol or 1,2-diol is an aliphatic diol that has two alcohol groups on adjacent carbon atoms. In industries, the most commonly used diol is ethylene glycol.