Chem Will a precipitate form on mixing equal volumes of the

Chem

Will a precipitate form on mixing equal volumes of the following solutions? 3.0 x 10-3 M BaCl2 and 2.0 x 10-3 M Na2CO3 1.0 x 10-5 M Ba(NO3)2 and 4.0 x 10-5 Na2CO3 The hydroxide ion has the formula OH-. The solubility-product constants for three generic hydroxides are given here. The removal of an ion is sometimes considered to be complete when its concentration drops to 1.00 x 10-6 M. What concentration of hydroxide would cause Y2+ to \"completely\" precipitate from a solution? Express your answer with the appropriate units.

Solution

A)

possible precipitate; Ba+2 and CO3- = BaCO3

Ksp = [Ba+2][CO3-2]

Ksp = 2.58×10^–9

if Q > Ksp, there will be precipitate

Q = [Ba+2][CO3-2]

Q = (3*10^-3)(2*10^-3) = 6*10^-6

since Q > Ksp

expect precipitation of BaCO3

YES

B)

similarly:

Q = [Ba+2][CO3-2]

Q = (10^-5)(4*10^-5)

Q = 4*10^-10

since Q < Ksp

expect NO precipitation

NO