The original instructions will give you a concentration of 0.0013 M.
If you dissolved 0.2 g of the gold chloride in 50 mL solution, and then did the same 25 mL -> 250 mL dilution, (or just dissolved it straight into
a 500 mL volumetric flask) then you would get the same concentration, and have 0.05 g gold(III) chloride left. |