Phosphoric acid is a triprotic acid with ,

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Phosphoric acid is a triprotic acid with pKa1=2.15pK_{a1}=2.15, pKa2=7.20pK_{a2}=7.20, and pKa3=12.35pK_{a3}=12.35. What is the predominant ionic form of phosphorus in an aqueous buffer maintained at pH=9.1pH = 9.1? (a) H2PO4−\mathrm{H_2PO_4^-} (b) HPO42−\mathrm{HPO_4^{2-}} (c) H3PO4\mathrm{H_3PO_4} (d) PO43−\mathrm{PO_4^{3-}}

Related theory

Browse the problem library