Malonic acid (H_2 C_3 H_2 O_4 or H_2 Mal for short) is a weak diprotic acid with

Question

Malonic acid (H_2 C_3 H_2 O_4 or H_2 Mal for short) is a weak diprotic acid with Kal = 1.6 Times 10^-3, Ka^2 = 2.0 Times 10^-7. It is a normally occurring acid found in many fruits. Malonic acid has two protons which can contribute to the pH of a solution. Can an assumption be made to simplify the determination of the pH? Explain the assumption and why it is valid? What is the pH of a 1.75 M solution of Malonic Acid? If disodium malate (Na_2 Mal) is added to the solution above will the pH increase, decrease, or stay the same? Explain.

Explanation / Answer

Malonic acid (H_2 C_3 H_2 O_4 or H_2 Mal for short) is a weak diprotic acid with

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