Asked by LT

If two salts AX and BX2, have the same Ksp values of 4.0x10^-12 at a given temperature, then

A. their molar solubilities in water are the same
B. the salts are more soluble in 0.1 M NaX than in water
C. the molar solubility of AX in water is less than that of BX2
D. addition of NaX will not affect the colubilities of the salt.
Answered by DrBob222
which do you think is correct and why? I suggest you make up problems and work each one; for example, see if A is a true statement.
AX ==> A^+ + X^-
Ksp = (x)(x) = 4 x 10^-12
x= sqrt 4 x 10^-12 = 2 x 10^-6 M

AX2 ==> A^+2 + 2X^-
Ksp = (x)(2x)^2 = 4 x 10^-12
4x^3 = 4 x 10^-12
x = 1 x 10^-4 M
So they are not the same and A is not true. ETC. For the common ion in B, just use 0.1 M NaX.
Answered by LT
well C says AX is less than BX2 and it is so i thought it would be that one.
Answered by DrBob222
That's right.
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