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15-01-2020
Chemistry

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Consider two acids: Cl2CHCO2H (dichloroacetic acid, pKa = 1.3) and HCO2H (formic acid, pKa = 3.8). Which acid has the larger Ka? Select the single best answer.

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16-01-2020

Answer:

[tex]Cl_2CHCO_2H[/tex]

Explanation:

pKa is defined as the negative logarithm of Ka.

Thus,

pKa = -log Ka

Thus, larger the value of Ka, smaller is the value of pKa.

Given that:-

[tex]Cl_2CHCO_2H[/tex] has a pKa = 1.3

[tex]HCO_2H[/tex] has a pKa = 3.8

Thus, lower value of pKa has the larger Ka which is [tex]Cl_2CHCO_2H[/tex], dichloroacetic acid ( 1.3 < 3.8 ) .

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