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10. What is the [CH3COOH ]/[CH3COO– ] ratio in an acetic acid/sodium acetate buffer at pH...

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Chemistry

10. What is the [CH3COOH ]/[CH3COO– ] ratio in an aceticacid/sodium acetate buffer at pH = 4.90? (Ka = 1.8 x 10–5 )

a. 0.31

b. 0.70

c. 1.45

d. 2.41

e. 4.90

11. How many grams of NaCH3COO should be added to 250 mL of0,100 M CH3COOH when the above solution is prepared?

a. 0.431 g

b. 2.95 g

c. 5.66 g

d. 1.43 g

e.11.9 g

Answer & Explanation Solved by verified expert
3.9 Ratings (730 Votes)
10 GivenpH 490 and Ka 18 105consider dissociation of acetic acid at equilibriumCH3COOH CH3COO Hnow equilibrium constant Ka CH3COO H CH3COOH equation 1from pH we can calculate concentration of HpH log10    See Answer
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