Which of the following pair of ions makes the water hard. | CHEMISTRY - WATER | SolveeIt | Solveeit

Today, August 18

Question

Which of the following pair of ions makes the water hard.

A

$Na^{+},\mspace{6mu} SO_{4}^{2 -}$

B

$K^{+},\mspace{6mu} HCO_{3}^{-}$

C

$Ca^{2 +},\mspace{6mu} NO_{3}^{-}$

D

$NH_{4}^{+},\mspace{6mu} Cl^{-}$

Answer

$K^{+},\mspace{6mu} HCO_{3}^{-}$

Explanation

Solution

$HCO_{3}^{-}$ is main reason of temporary hardness of water.