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19/10/2021 10:45 am
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What would be the pH of a solution obtained by mixing 5g of acetic acid and 7.5g of sodium acetate and making the volume equal to 500 mL? (Ka = 1.75 × 10-5, pKa = 4.76)
(a) pH = 4.70
(b) pH < 4.70
(c) pH of solution will be equal to pH of acetic acid
(d) 4.76 < pH < 5.0
1 Answer
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19/10/2021 10:48 am
Correct answer: (d) 4.76 < pH < 5.0
Explanation:
pH = pKa + log\(\frac{[salt]}{[acid]}\)
= 4.76 + log\(\frac{\frac{7.5}{500}}{\frac{5}{500}}\)
= 4.7 + log 1.5 = 4.87
Hence correct answer is 4.76 < pH < 5.0
This post was modified 3 years ago 2 times by Mayank1444