The ph of a sodium acetateacetic acid buffer is 450

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5.The pH of a sodium acetate–acetic acid buffer is 4.50. Calculate the ratio [CH3COO]/[CH3COOH]. (5 points)
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6.Calculate the pH of the 0.20 MNH3/0.20 MNH4Cl buffer. What is the pH of the buffer after the addition of 10.0 mL of 0.10 MHCl to 65.0 mL of the buffer? points)(8
7.A 0.2688 g sample of a monoprotic acid neutralized 16.4 mL of 0.08133 M KOH solution. Calculate the molar mass of the acid. (5 points)
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(Reference: Chang 16.27)8.In a titration experiment, 12.5 mL of 0.500 MH2SO4neutralize 50.0 mL of NaOH. What is the concentration of the NaOH solution? (5 points)
9.A 0.1276 g sample of an unknown monoprotic acid was dissolved in 25.0 mL of water and titrated with 0.0633 MNaOH solution. The volume of base required to bring the solution to the equivalence point was 18.4 mL. (a) Calculate the molar mass of the acid. (b) After 10.0 mL of base had been added during the titration, the pH was determined to be 5.87. What is the Kaof the unknown acid? (10 points)

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