cvg.cengagenow.com OWLv21 Onli The Volume Of Water Needed To Di. Assume You Diss

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cvg.cengagenow.com OWLv21 Onli The Volume Of Water Needed To Di. Assume You Dissolve 0.153 G Of Th Chapter 17 HW Review Topics] References] Use the References to access important values if needed for this question. A buffer solution contains 0.470 M KHCO, and 0.306 M Na,Co If 0.0205 moles of potassium hydroxide are added to 125 mL of this buffer, what is the pH of the resulting solution ? (Assume that the volume does not change upon adding potassium hydroxide) pH- Submit Answer Retry Entire Group 9 more group attempts remaining

Explanation / Answer

after 0.0205 / 0.125 = 0.164 M KOH added

[HCO3-] = 0.470 - 0.164 = 0.306 M

[CO3-2] = 0.306 + 0.164 = 0.470 M

pH = pKa + log [CO3-2] / [HCO3-]

pKa of HCO3- = 10.3

pH = 10.3 + log [0.470] / [0.306]

pH = 10.49

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