Calculate the pH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic...

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Question

science chemistry

Answer 1

Answer #1

5. Its an example for Acidic Buffer

pH = pKa + log (concentration x volume)_salt/ (concentration x volume)_Acid

= 3.86 + log [(1x 25)/ 1x 75)]

= 3.86 + log (1/3)

= 3.86 -0.48

pH = 3.38

6. Its an example for Acidic Buffer

The added OH- will reacts with acid and forms salt . Hence salt concentration will increases and acid concentration decreases.

Hence, pH = pKa + log {[salt] + 0.01 / [Acid] - 0.01}

pH = 4.76 + log {0.5 + 0.01/ 0.5 - 0.01}

pH = 4.76 + log (0.51/0.49)

pH = 4.76 + log (1.04)

= 4.76 + 0.017

pH = 4.77

Answer 2

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