Question

Which of the following will have highest conductivity?
A.)0.1M CH3COOH
B.)0.1 M NaCl
C.)0.1 M KNO3
D.)0.1 M HCl

Answer 1

D)0.1M HCl

because it is strong acid and strongly dissociate h+ions in water

Answer 2

Answer:

$0.1M$ $HCl$ has the highest conductivity.

Therefore, option d)  $0.1M$ $HCl$ is correct.

Explanation:

Conductivity:

• It is the measure at which the electric current can travel through the aqueous solution.

Now, the concentration of all the given solutions is the same, i.e., $0.1M$.

A) $0.1M$ $CH_{3}COOH$:

• It is a weak electrolyte as it does not completely dissociate into ions in an aqueous solution.
• $CH_{3}COOH \rightarrow CH_{3}COO^{-} + H^{+}$

Hence, its conductivity is low.

B) $0.1M$ $NaCl$

• It is a neutral salt of strong acid and a strong base.
• $NaCl$ is a strong electrolyte as it completely dissociates into ions in an aqueous solution.
• $NaCl \rightarrow Na^{+} + Cl^{-}$

Hence, it has high conductivity.

C)  $0.1M$ $KNO_{3}$

• It is also a neutral salt of strong acid and a strong base.
• $KNO_{3}$ is a strong electrolyte as it completely dissociates into ions in an aqueous solution.
• $KNO_{3} \rightarrow K^{+} + NO_{3} ^{-}$

Hence, it has also high conductivity.

D) $0.1M$ $HCl$

• $HCl$ is a strong electrolyte as it completely dissociates into ions in an aqueous solution.
• $HCl \rightarrow H^{+} + Cl^{-}$

Hence, it has also high conductivity.

Now, $0.1M NaCl$,  $0.1M$ $KNO_{3}$,  $0.1M$ $HCl$ are all strong electrolytes.

But conductivity also depends upon the size.

• The smaller the size of ions faster the mobility; the higher will be the conductivity.

From $NaCl$, $KNO_{3}$, $HCl$, the $H^{+}$ ion is the smallest hence conductivity will be the highest.

Therefore, $0.1M$ $HCl$ will have the highest conductivity.