Question

The phosphate in a 3.000-g sample of industrial detergent was precipitated by the addition of 1.000 g of AgNO3. The solution was filtered and the filtrate required 18.23 mL of 0.1377 M KSCN for titration to the FeSCN2+ end point. Calculate the percentage of phosphate in the detergent.

Answer 1

For this problem we need to utilize the concept fo back litration,

Here the amount of phasphation can be calculated by adding a measured of nouns of sliver nirtate solution to a solution of the sample which will lead to formation of is insoluble and hence will precipitate out. Then fillerd off

Now after the filtration of preciitate, the tillrate will only have the which did not react to , which can be titacted with a standard solution so

For this problem we need to utilize the concept fo back litration,