In a diprotic acid, such as maleic acid, the first ionization constant is always larger than the second ionization constant. Therefore, essentially all of the H^ is produced from the first ionization step. You can make the assumption that the amount of H^ produced by the second ionization is not enough to greatly influence the rm pH of the solution. Therefore, K_a1 can be calculated from the available data using the first ionization step. To determine the K_a2 value additional information would be required.

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In a diprotic acid, such as maleic acid, the first ionization constant is always larger than the second ionization constant. Therefore, essentially all of the H^ is produced from the first ionization step. You can make the assumption that the amount of H^ produced by the second ionization is not enough to greatly influence the rm pH of the solution. Therefore, K_a1 can be calculated from the available data using the first ionization step. To determine the K_a2 value additional information would be required.

This post is last updated on hrtanswers.com at Date : 1st of September – 2022