Question

In: Chemistry

Buffer Solution from Strong Base and Weak Acid Solution= 30.0 mL of 1.0 M CH3COOH 5.0...

Buffer Solution from Strong Base and Weak Acid

Solution=
30.0 mL of 1.0 M CH3COOH
5.0 mL of 1.0 M NaOH

1. Calculate the total volume. 35 mL

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

3. What is the concentration of sodium hydroxide in this solution after mixing (include units)

4. Calculate the expected pH of this buffer solution.

5. Measured pH of this buffer solution. 3.89

Expert Solution

1)

total volume = 35 mL

2)

millmoles of CH3COOH = 30 x 1 = 30

millimoles of NaOH = 5 x 1 = 5

CH3COOH + NaOH ----------------> CH3COONa + H2O

30 5 0 0

25 0 5

concentration of acetic acid = 25 / 35

concentration of acetic acid = 0.714 M

3)

concentration of NaOH = 0 M

4)

pH = pKa + log [salt / acid]

= 4.74 + log [5 / 25]

pH = 4.04

queen_honey_blossom answered 2 years ago

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