Question

Assuming equal concentrations, arrange these solutions by pH. Highest Ph to lowest Ph.

Ca(OH)2(aq) NH3(aq) HCN(aq) LiOH(aq) HCl(aq)

Answer 1

$Ca(OH)_2$ completely dissociates to yield 2 moles of $OH^-$ while $LiOH$

produces 1 mole

$NH_3$ partially dissociate to yield $OH^-$

HCN partially dissociates to produce

$H^+$ ions while $HNO_3$ completely dissociates to yield $H^+$ ions

Descending order with respect to pH:

$Ca(OH)_2\>,LiOH,\>NH_3,\>HCN,\>HNO_3$