Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH ?

Question

Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH ? (A)  SrCl2 (B) BACl2 (C) MgCl2 (D) CaCl2

Tardigrade Admin · Accepted Answer

All salts are soluble in water and give strong acid
and weak base

S r C l_{2} + 2 H_{2} O ⟶ S r (O H)_{2} + 2 H Cl

B a C l_{2} + 2 H_{2} O ⟶ B a (O H)_{2} + 2 H Cl

M g C l_{2} + 2 H_{2} O ⟶ M g (O H)_{2} + 2 H Cl

C a C l_{2} + 2 H_{2} O ⟶ C a (O H)_{2} + 2 H Cl

The basic nature of alkaline earth metals is
generally increases from Be to Ra. Thus, the order of
basic nature of these hydroxides is

M g (O H)_{2} < C a (O H)_{2} < S r (O H)_{2} < B a (O H)_{2}

Hence, pH is highest for

B a C l_{2}

. (As pH increases
with basic nature)

Q. Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH ?

$S r C l_{2}$

$B A C l_{2}$

$M g C l_{2}$

$C a C l_{2}$

Q. Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH ?

SrCl2​

BACl2​

MgCl2​

CaCl2​

$S r C l_{2}$

$B A C l_{2}$

$M g C l_{2}$

$C a C l_{2}$