Predicting the Formation of a Precipitate
Solution: Both Na2CrO4 and Ba(NO3) are soluble, so we will have Na+, CrO42-, Ba2+ and NO3- ions present in 0.300 L of solution. We change partners, look up solubilities, and we find that BaCrO4 would be insoluble, so we calculate itís ion-product constant and compare it to the solubility product constant of 2.1 x 10-10 .
[Ba2+] = = 0.183 M in Ba2+
For Ba2+: [0.100 L Ba(NO3)2] [0.55 M] = 0.055mol Ba2+
0.055 mol Ba2+
0.300 L
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