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70-Buffer-Prob

# 70-Buffer-Prob - 3 solution to produce a buffer solution...

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BUFFER SOLUTIONS GCHEM II LAB CONCEPT PROBLEMS 1a. Calculate the pH of a buffer solution made from 0.380 M acetic acid (HC 2 H 3 O 2 ) and 0.150 M sodium acetate (NaC 2 H 3 O 2 ). The Ka acetic acid is 1.8 x 10 –5 . R eaction I nitial (moles/L) C hange (+/–) E quilibrium 1b. Calculate the pH using Henderson Hasselbalch equation. 2a. Calculate the pH of a buffer solution made from 200.0 mls of 0.150 M benzoic acid (HC 7 H 5 O 2 ) and 100.0 mls of 0.0150 M potassium benzoate (KC 7 H5O 2 ). The Ka benzoic acid is 6.30 x 10 –6 . R eaction I nitial (moles/L) C hange (+/–) E quilibrium 3. Calculate the grams of NaCHO 2 ( MM=68.11 g/mole ) that must be added to 1.0 L of a 0.200 M solution of HCHO 2 to produce a buffer with a pH of 3.30. The Ka HCHO 2 is 1.85 x 10 –6 . R eaction I nitial (moles/L) C hange (+/–) E quilibrium

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4. Calculate the grams of NH 4 Cl (MM=52.48 g/mole) that must be added to 1.0 L of a 0.0250 M NH
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Unformatted text preview: 3 solution to produce a buffer solution with a pH of 3.85. The Kb NH 3 is 1.85 x 10 –9 . R eaction I nitial (moles/L) C hange (+/–) E quilibrium 5. Calculate the pH of a buffer solution consisting of 0.50 M HC 2 H 3 O 2 and 0.40 M NaC 2 H 3 O 2 after the addition of 0.020 moles of NaOH. Ka for HC 2 H 3 O 2 1.8 X 10-5 . R eaction I nitial (moles/L) C hange (+/–) C ompletion R eaction I nitial (moles/L) C hange (+/–) E quilibrium 6. Calculate pH of a buffer solution consisting of 0.750 M NH 3 and 0.250 M NH 4 Br after the addition of 0.120 moles of HCl. The Kb NH 3 is 1.75 X 10-5 . R eaction I nitial (moles/L) C hange (+/–) C ompletion R eaction I nitial (moles/L) C hange (+/–) E quilibrium Jpechunf11/2003...
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70-Buffer-Prob - 3 solution to produce a buffer solution...

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