What is the ph of a buffer that is 0.6 m hf and 0.2 m naf? the ka of hf is 6.8 × 10−4. what is the ph of a buffer that is and ? the of is . 3.65 2.69 3.17 3.50?

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07-11-2017
Chemistry

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What is the ph of a buffer that is 0.6 m hf and 0.2 m naf? the ka of hf is 6.8 × 10−4. what is the ph of a buffer that is and ? the of is . 3.65 2.69 3.17 3.50?

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Kalahira Kalahira · Answer 1 · 2017-11-18T16:35:41+01:00

Kalahira Kalahira

18-11-2017

pH = pKa + log([A^-]/[HA]) [A^-] = [KF] = 0.43 M, [HA] = [HF] = 0.20 M pKa = -logKa = -log(6.8x10^-4) = 3.17 pH = 3.17+ log(0.43 / 0.20) = 3.50 You can determine the [H3O^+] by using the equation for pH pH = -log[H3O^+] [H3O^+] = 10^-pH = 10^-3.50 = 3.16x10^-4 M

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