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A standardized 0.1000 M NaOH solution was used to determine the amount of H3PO4 and KH2PO4...

A standardized 0.1000 M NaOH solution was used to determine the amount of H3PO4 and KH2PO4 in a 25.00-mL unknown sample. It's known that 11.05 mL of the NaOH solution was consumed to reach the first equivalence point and an additional 21.60 mL of the NaOH solution was used to reach the second end point.

a) Please determine the concentration of the H3PO4 present in the unknown.

b) What's the concentration of the KH2PO4 present in the unknown?

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Homework Answers

Answer #1

a. M1 = Molarity of NaOH = 0.1 M

M2 = Molarity of H3PO4 = ?

V1 = Volume of NaOH = 11.05 mL

V2 = Volume of Unknown sample = 25 mL

M1 V1 = M2 V2

0.1 * 11.05 = M2 * 25

M2 = 0.0442 M

Concentration of the H3PO4 present in the unknown = 0.0442 M

b. M1 = Molarity of NaOH = 0.1 M

M2 = Molarity of KH2PO4 = ?

V1 = Volume of NaOH = 21.60 mL

V2 = Volume of Unknown sample = 25 mL

M1 V1 = M2 V2

0.1 * 21.60 = M2 * 25

M2 = 0.0864 M

Concentration of the KH2PO4 present in the unknown = 0.0864 M

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