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III. Buffer Solutions A. Buffer 1 i. Measure out 10.0 mL of 1.0 M CH3COOH and...

III. Buffer Solutions

A. Buffer 1

i. Measure out 10.0 mL of 1.0 M CH3COOH and 25.0 mL of 1.0 M sodium acetate (NaCH3COO) into a beaker

2. What is the concentration of acetic acid in this solution after mixing. (include units) [CH3COOH] ?

3. What is the concentration of acetate ion in this solution after mixing.(include units) [CH3COO-] ?

4. Calculate the expected pH of this buffer solution.

5. Measured pH of this buffer solution pH: 5.31

I have no idea how to do number 2,3,4 and I have to repeat these processes/ questions for different solutions. If you could show me how to do these, I would greatly appreciate it! Thank you so much in advance.

Solutions

Expert Solution

2) . What is the concentration of acetic acid in this solution after mixing.

[CH3COOH] = millimoles of CH3COOH / total volume

                     = 10 x 1 / (10 +25)

                      = 0.286 M

[CH3COOH] = 0.286 M

3. What is the concentration of acetate ion in this solution after mixing

[CH3COO-] = millimoles of CH3COONa / total volume

                     = 25 x 1 / (10 +25)

                      = 0.714 M

[CH3COO-] = 0.714 M

4. Calculate the expected pH of this buffer solution.

millimoles of NaCH3COO = 25 x 1.0 = 25

millimoles of CH3COOH = 10 x 1.0 =10

this mixture is buffer

so

pH = pKa + log [CH3COONa ]/ [CH3COOH]

pH = 4.74 + log (25/10)

pH = 5.14

queen_honey_blossom answered 8 months ago
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