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This quiz contains 7 questions from a mix of 1 subtopics.

What is the correct equation for the dissociation constant (Ka) of a weak acid (HA)?

Ka ​=[H+][A−][HA]​
Ka ​=[A−][H+][HA]​
Ka ​=[HA][H+][A−]​
Ka ​=[H+][A−][HA]​

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What does a larger Ka value indicate?

greater dissociation of HA

lower dissociation of HA

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What does a smaller pKa value indicate?

stronger acid

weaker acid

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A acid partially dissociates in aqueous solution.

weak

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How can the pKa of a weak acid be calculated using the Ka expression?

pKa ​=−log10​Ka​
pKa ​=log10​Ka​
pKa ​=√Ka​​
pKa ​=Ka​1​

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Calculate the pH of a 0.0250 mol dm-3 solution of ethanoic acid.

Ka for ethanoic acid = 1.80 x 10-5 mol dm-3

Give your answer to 2 decimal places.

3.17

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The pH of a 0.055 mol dm-3 solution of propanoic acid is 3.08. 

Calculate the Ka of propanoic acid.

1.51 x 10-2 mol dm-3

1.26 x 10-5 mol dm-3

8.31 x 10-4 mol dm-3

6.92 x 10-7 mol dm-3

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