a) Explain what is meant by a weak acid. b) Identify the weakest acid in the table above. c)...

Question:

The table below shows the values of the acid dissociation constant, Ka_(T) for three acids.

{eq}\begin{array}{c|c|c} \hline \text{Name}&\text{Formula}& Ka_{(T)}/\text{mol-dm}^{-3} \\ \hline \text{Methanoic acid}&HCO_2H&1.60 \times 10^{-4}\\ \text{Ethanoic acid}&CH_3CO_2H&1.73 \times 10^{-5} \\ \text{Carbonic acid}&H_2CO_3&4.3 \times 10^{-7} \\ \hline \end{array} {/eq}

a) Explain what is meant by a weak acid.

b) Identify the weakest acid in the table above.

c) Calculate the {eq}Kp_{ (T)} {/eq} of ethanoic acid.

Acid and Their Strength:

According to the Bronsted-Lowry concept, acid is a substance that donates or losses protons example- HCl.

The strength of the acid can be determined by its ability to dissociate in water to lose protons. Thus, acidic strength can be determined by its dissociation constant.


Answer and Explanation: 1

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a) Any acid is said to be weak if it does not dissociate completely in the aqueous solution. As they do not dissociate completely in the aqueous...

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Weak Acids: Properties & Examples

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Chapter 28 / Lesson 13
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Learn the definition of weak acids, study common examples, discover the difference between strong and weak acids, and understand how to write weak acid equilibrium equations.


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