Lactic Acid Buffer

Chemistry Level 2

You create a buffer using 125 mL of 3.2 M lactic acid, and an unknown amount of C a ( C X 3 X 2 3 2 H X 5 O X 3 ) X 2 \ce{Ca( C _3 H5O3)2} . If the K a K_a of lactic acid is 1.38 × 10 4 1.38\times { 10 }^{ -4 } and the resultant pH of the buffer is 4.16, how many moles of calcium lactate did you add?


The answer is 0.40.

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