Question

Which two formulas represent Arrhenius acids?

Answer 1

The answer is (2) HC2H3O2 and H3PO4.

Answer 2

Answer : The correct option is, (2) $HC_2H_3O_2\text{ and }H_3PO_4$

Explanation :

Arrhenius theory : It sates that an acid is a type of substance that ionizes in the water to give the hydronium ion or hydrogen ion $(H^+)$ and a bases is a type of substance that ionizes in the water to give hydroxide ion $(OH^-)$.

Or we can say that,

Arrhenius acid are those which can easily gives the hydrogen ion in a solution and Arrhenius base are those which can easily gives the hydroxide ion in a solution.

In option 1, $CH_3COOH$ can easily gives the hydrogen ion but $CH_3CH_2OH$ can not gives the hydrogen ion due to stronger O-H bonding. So, these formulas does not represent Arrhenius acids.

In option 2, $CH_3COOH$ and $H_3PO_4$ can easily gives the hydrogen ion. So, these formulas represent Arrhenius acids.

In option 3, $KHCO_3$ and $KHSO_4$can not gives the hydrogen ion because both are the salts. So, these formulas does not represent Arrhenius acids.

In option 4, $NaSCN$ and $Na_2S_2O_3$can not gives the hydrogen ion because no hydrogen present in the compound. So, these formulas does not represent Arrhenius acids.

Hence, (2) $HC_2H_3O_2\text{ and }H_3PO_4$ represent Arrhenius acids.