DATA TABLE Buffer A Buffer B Mass of NaC 2 H 3 O 2 used to prepare buffer (g) 0.
ID: 534934 • Letter: D
Question
DATA TABLE
Buffer A
Buffer B
Mass of NaC2H3O2 used to prepare buffer (g)
0.149 g
1.49 g
Volume of buffer prepared (mL)
100.0
100.0
Molar concentration of HC2H3O2 in buffer (M)
0.1
1.0
Initial pH of buffer
4.24
4.33
Volume of 0.5 M NaOH to raise pH by 2 units (mL)
1.5
19.0
Volume of 0.5 M HCl to lower pH by 2 units (mL)
1.0
5.0
Volume of 0.5 M NaOH at equivalence point (mL)
1.75
19.75
DATA ANALYSIS
1. Write reaction equations to explain how your acetic acid-acetate buffer reacts with an acid and reacts with a base.
Buffer A
Buffer B
Mass of NaC2H3O2 used to prepare buffer (g)
0.149 g
1.49 g
Volume of buffer prepared (mL)
100.0
100.0
Molar concentration of HC2H3O2 in buffer (M)
0.1
1.0
Initial pH of buffer
4.24
4.33
Volume of 0.5 M NaOH to raise pH by 2 units (mL)
1.5
19.0
Volume of 0.5 M HCl to lower pH by 2 units (mL)
1.0
5.0
Volume of 0.5 M NaOH at equivalence point (mL)
1.75
19.75
Explanation / Answer
Let, base = NaOH and acid = HCl
So acetic acid-acetate buffer will react in the manner as:
CH3COOH + NaOH = CH3COONa + H2O
CH3COO- + HCl = CH3COOH + Cl-
ie weak acid and its sodium salt will be form as products.
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