Isiluv

I am required to analyze a sample prepared in inorganic chemistry, but after going through the outlined steps, I have the following: Weight of ppt = Chemical factor = Concentration in 10 ml = Concentration in 1L = % of Ni+ = I have the weight of my precipitate, but I am confused on what chemical factor stand for. I started with 0.2 grams of the prepared salt and the molecular weight of the compound is 394.99, while am to calculate the concentration of Nickel ion in the salt. How do I go about this?