A student dilutes a solution of 0.100 mol of H3PO4 and 0.150 molof NaOH with water to a volume of 1.00 L but then realizes that the\"distilled water\" used was in fact dilute hydrochloric acid.
(A) If the pH of the final solution is 6.62, what are theconcentrations of H3PO4, H2PO^−4, and HPO^2−4?
(B) How many moles of HCl were inadvertently added to theoriginal solution?
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