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A student dilutes a solution of 0.100 mol of H3PO4 and 0.150 mol of NaOH with...

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Chemistry

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?

Many Thanks

Answer & Explanation Solved by verified expert
4.2 Ratings (545 Votes)
In preparing the original solution the NaOH will neutralize the first H of H3PO4 completely and will neutralize 12 of the H2PO4 so that the solution contains 005 M H2PO4 and 005 M HPO42    See Answer
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