QUESTION 2 A buffer solution is titrated with 0.032 M HCI solution. The initial
ID: 1063620 • Letter: Q
Question
QUESTION 2 A buffer solution is titrated with 0.032 M HCI solution. The initial volume of the buffer is 25.000 mL. The equivalence point of the titration is determined to be 4.88 mL. What is the concentration of conjugate base (in M) in the buffer solution? Assume the stoichiometry of acid to base is 1:1. 10 points QUESTION 3 A buffer solution is titrated with 0.046 M NaOH solution. The initial volume of the buffer is 25.00 mL. The equivalence point of the titration is determined to be 8.77 mL. What is the concentration of acid (in M) in the buffer solution? Assume the stoichiometry of acid to base is 1:1. 10 points QUESTION 4 The concentrations of acid and conjugate base in a buffer are determined experimentally to be 0.044 M and 0.059 M, respectively. If the total buffer concentration given on the bottle (the true value) is 0.102 M, then what is the percent error of the experimental value? 10 points QUESTION 5 There are several calculations that need to be done in order to prepare a specific volume of buffer solution at a particular concentration and pH. There is a worked example in your lab manual on p. 119 First, determine the correct A/HA ratio: The pKa of acetic acid is 4.76, and the buffer solution needs to maintain a pH of 4.25. The concentration of acetate (CH3CO2 should be X times that of the concentration of acetic acid (CH3Co2H0. What is X 10 pointsExplanation / Answer
(2)
Molarity of HCl = 0.032 M
Volume of HCl = 4.88 mL
Volume of Buffer= 25 mL
Molaity of Buffer= M
We know that,
M1V1 = M2V2
M x 25 mL = 0.032 M x 4.88 mL
Molarity of buffer = 0.00625 M
(3)
Molarity of NaOH = 0.046 M
Volume of NaOH= 8.77 mL
Volume of Buffer= 25 mL
Molaity of Buffer= M
We know that,
M1V1 = M2V2
M x 25 mL = 0.046 M x 8.77 mL
Molarity of buffer = 0.01614 M
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