chicalapingpon3786 chicalapingpon3786

20-10-2017
Chemistry

contestada

Calculate the ph of a solution that is 0.278 m in sodium formate (nahco2) and 0.222 m in formic acid (hco2h). the ka of formic acid is 1.77 × 10^-4.

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akiyama316 akiyama316

30-10-2017

Use the formula:

pH = pKa + log[Conjugate base] / [Acid]

= -log(1.77 × 10^-4) + log[0.278] / [0.222]

= 3.75 + 0.097
= 3.84

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