Other Compound Concepts

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Which of the following are strong electrolytes?

$\text{HCl}$

$\text{HC}_2\text{H}_3\text{O}_2$

$\text{NH}_3$

$\text{KCl}$

$\text{Cu(NO}_3)_2$

Three

CORRECT

One

Two

Four

All five

Explanation

Strong electrolytes are substances that exists in solutions as only ions. These substances dissociate 100% in solutions. Strong acids, strong bases, and salts are all examples of strong electrolytes. $\text{HCl}$ is a strong acid. $\text{KCl}$ is a salt. $\text{Cu(NO}_3)_2$ is a salt. $\text{HC}_2\text{H}_3\text{O}_2$ is a weak acid. $\text{NH}_3$ is a weak base. Therefore the answer is three.

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