# Lactic Acid Buffer

Chemistry Level pending

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

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