Phosphate is one of the major buffer systems in the blood. Phosphate has the following pK values for the dissociation of each of its three protons: pK1 = 2.1, pK2 = 7.1, and pK1 = 12.7. Its buffering ability is lowest at which of the following pH values? a.  7.0                              b. 7.3                                                  c. 12.6                                        d.  4.3

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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.