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PH, easy question..?

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What is the pH of a buffer containing 0.45 mol of CH3COOK added to 1L of 2M CH3COOH?

*assume pKa of acetic acid is 4.75

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  1. Henderson- Hasselbalch equation

    http://en.wikipedia.org/wiki/Henderson_H...

    pH = pKa + log [anion] / [acid]

    pH = 4.75 + log [0.45] / [2]

    pH = 4.75 + log 0.225

    pH = 4.75 -.0.65

    your answer is:  pH = 4.10

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