1. Sulfide can be determined indirectly with EDTA. In essence, Cu is used to precipitate the sulfide and then EDTA is used to determine the excess copper. If a 25.00ml aliquot of a solution containing sulfide ions was added to 25.00ml of 0.0115MCu2+ solution. The CuS precipitate was washed and collected. The pH of the combined filtrate and washings was then adjusted by the addition of ammonia and the solution was titrated with 0.01453 M EDTA, using a suitable indicator. The endpoint volume was found to be 12.43ml. Find the mplarity of the sulfide in the sample solution