Calculate the pH of a buffer made by mixing 200 ml (.2 M) of .1 M HF and 200 ml of .15 M NaF.
Ka = 6.8 x 10^-4
AP Chemistry pH buffer question?? Help!?
2017-11-27 7:51 am
回答 (2)
2017-11-27 8:23 am
✔ 最佳答案
HF(aq) ⇌ H⁺(aq) + F⁻(aq) …. Ka = 6.8 × 10⁻⁴[F⁻]/[HF] = 0.15/0.1 = 1.5
pH = pKa + log([F⁻]/[HF]) = -log(6.8 × 10⁻⁴) – log(1.5) = 3.0
2017-11-27 7:53 am
200 rainbows
收錄日期: 2021-04-18 17:58:16
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