400 mg of a butter sample was heated and some water was added. After shaking and filtration 10 ml 0.2 M Ag* solution, some HNO3 and a few drops of Fe* solution were added to the filtrate. The excess Ag+ in the filtrate was titrated with 01. M standard SCN solution. If the volume of SCN at the equivalence point was 15 mL, calculate the mass percent of NaCl (FW = 58.5 g/mol) in the butter sample

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