Predict if the following conditions would result in the formation of a precipitate, explain briefly:
a) 0.0025 M Fe 3+ at pH 6.00
b) 0.0025 M Ba 2+ and a 1.25x10^-4 M solution of sodium sulfate
c) 0.05 M Ca 2+ and a 1.25x10^-4 M solution of cesium phosphate.