the solubility of a salt, MX2 (MW = 58.3 g/mol) is 1.44e-4/10.0mL at 25 C. what is the value of Ksp for MX2 at 25 C?

Question

the solubility of a salt, MX2 (MW = 58.3 g/mol) is 1.44e-4/10.0mL at 25 C. what is the value of Ksp for MX2 at 25 C?

Answer 1

for this you have, 

1.44e-2 g in 1 L. 

molar mass=58.3g/mol 

no. of moles per L i.e. molarity=.000247M or 2.47e-4M

next form a rough eqn of reaction

MX2 ----->> M2- +2X- 

this shall be the molal conc. of ions 

i.e.M2- =2.47e-4 M 

X- =(2)  2.47e-4 M

now 

Ksp=[M2-][X-]^2 

=2.47e-4*(2*2.47e-4M)^2 

= 6.028e-11