Six (12 Points). A solution of Ca(NO3)2 has a concentration of 4.0 x 10-M. Determine the...

Question

Question

science chemistry

Answer 1

Answer #1

Solution:

The option will be K2SO4.

Because K2SO4 reacts with Ca(NO3)2 to form a sparingly soluble salt CaSO4.

Ca(NO3)2 + K2SO4 = CaSO4 + 2KNO3

Ca(NO3)2 is dissociated as,

Ca(NO3)2. = Ca2+ + 2NO3-

4 x 10^-5 M = 4 x 10^-5 M -- 2 x 4 x 10^-5 M

Thus

[Ca2+] = 4 x 10^-5 M

Ksp for CaSO4 = 7.1 x 10^-5 M

Ksp = [Ca2+] [SO4--]

[SO4--] = Ksp / [Ca2+] = 7.1 x 10^-5/4 x10^-5

= 1.775

Thus, [SO4--] = 1.8 M

Therefore,

Solution of K2SO4 must posses concentration of 1.8 M.

Answer 2

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