Question

In a permutit, the calcium and magnesium ions of hard water are exchanged by

• A. $CO_{3}^{2 -}$and $HCO_{3}^{-}$ions of permutit
• B. $Na^{+}$ions of permutit
• C. $Al^{3 +}$ions of permutit
• D. $si^{4 +}$ions of permutit

Answer 1

Answer: (B)

$Na^{+}$ions of permutit

Answer 2

$Na_{2}Al_{2}Si_{2}O_{8}.xH_{2}O + Ca^{2 +}(orMg^{2 +}) \rightarrow$

$CaAl_{2}Si_{2}O_{8}.xH_{2}O + 2Na^{+}$