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3. Calculate the concentration of the 25mL of phosphoric acid Which is neutralized with 7.8 mL...

3. Calculate the concentration of the 25mL of phosphoric acid Which is neutralized with 7.8 mL of 0.2M NaOH?

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Answer #1

H3PO4 + 3NaOH -----> Na3PO4 + 3H2O

H3PO4                       NaOH

M1 = ?                       M2 = 0.2 M

V1 = 25 mL               V2 = 7.8 mL

n1 = 1                       n2 = 3

M1V1/n1 = M2V2/n2

M1 = M2V2n1/V1n2

      = 0.2*7.8*1/(25*3)

      = 0.0208 M

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