Chem Will a precipitate form on mixing equal volumes of the following solutions?
ID: 707774 • Letter: C
Question
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.Explanation / Answer
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
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