Buffer Solutions Investigation
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Buffer Solutions Investigation
Plan and chemistry
The team prepares an acidic buffer from ethanoic acid, CH₃COOH, and sodium ethanoate, CH₃COONa. For calculations use pKₐ = 4.76 and pH = pKₐ + log₁₀([CH₃COO⁻]/[CH₃COOH]).
- HCl and NaCl
- CH₃COOH and CH₃COONa
- NaOH and NaCl
- H₂SO₄ and Na₂SO₄
Analyse the buffer data
A technician makes 100.0 mL samples. Each receives 1.00 mL of 0.100 mol L⁻¹ HCl or 1.00 mL of 0.100 mol L⁻¹ NaOH. Initial and final pH readings are recorded below.
Sample
Initial pH
Reagent added
Final pH
Distilled water
7.00
HCl
3.00
Buffer
4.76
HCl
4.67
Buffer
4.76
NaOH
4.85
2 printable pages
Page 1
Page 2
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