Final answer:
The mixture of KCl and Ba(NO3)2 in water will not form a precipitate as both compounds are soluble, according to solubility rules.
Step-by-step explanation:
The question involves the concept of solubility and precipitation reactions in chemistry. When mixing solutions of KCl and Ba(NO3)2, one must consider the solubility rules to predict the outcome of the reaction. For example, when mixing Ba(NO3)2 with a sulfate source, one possible precipitate could be BaSO4, due to its low solubility. However, the question does not mention a sulfate source, so no precipitation of BaSO4 would occur in a mixture of just KCl and Ba(NO3)2. Instead, all species would remain soluble, and no precipitate would form, as both KCl and Ba(NO3)2 are soluble in water.