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![pH=pKa+ log( \frac{[HCOONa]}{[HCOOH]} )=3,75 + log( \frac{0,11M}{0,17M} )=3,56](/tpl/images/0130/5268/b55f5.png)
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Asolution that is 0.17m in hcho2 and 0.11 min in nacho2...
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