Calculate the pH of each of the following aqueous solutions. 0.0400 M malonic acid 0.0400 M...

Question

Question

Calculate the pH of each of the following aqueous solutions.

0.0400 M malonic acid

0.0400 M monosodium malonate (sodium hydrogen malonate) [use the most accurate and the most approximate formulas and compare the two]

0.0400 M disodium malonate

Answer 1

Answer #1

pH= -log[H+]

ph= -log [normality]

pH= -log [molarity*valency]

malonic acid is divalent acid so valency=2

pH= -log [0.0400*2]

= 1.096

Monosodiukm malonate each mole will produce 1 hydrogen atom so

pH= pH= -log [0.0400*v1]

1.39

disodium malonate cannot give any hydrogen so its a salt and its pH=7

Answer 2

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