Question

What will be the valency factor for following bases
$CsOH$ and $Al(OH{)}_3$ respectively?

• A. 1 and 1 or 2 or 3
• B. 3 and 1 or 2 or 3
• C. 1 and 3
• D. -1, -3

Answer 1

The correct option is A 1 and 1 or 2 or 3

In case of acid-base reaction, the valency factor is the actual number of $H^{+}$ or $O{H}^{-}$ replaced in the reaction. The acid or base may contain more number of replacable $H^{+}$ or $O{H}^{-}$ than actually replaced in reaction.
Valency factor for base is the number of $O{H}^{-}$ ion replaced by one of the mole of base.
$CsOH$ can replace 1 $O{H}^{-}$ and $Al(OH{)}_3$ can replace 1 or 2 or 3 $O{H}^{-}$ depending on the reaction and hence valency factor for $CsOH$ is 1 and for $Al(OH{)}_3$ either 1 or 2 or 3.