I have an unknown salt mixture, which was heated and the mass of the precipitate was calculated. The limiting reactant was determined, and based on this data I should be able to determine the salt mixture composition, but I have no idea where to even begin.
I must assume you have the mass of the known reactant in the data you have available as well as its identity. The mass of the precipitate is known. Therefore the mass of the unknown in the precipitate is the difference between the mass of the precipitate and the known reactant as all of the known reactant finds itself in the salt. Now this ...
This solution is provided in 265 words. It discusses how component ion ratios, known reactants, and colour and precipitate can be used to determine the counterion.