2g of a compound Q ,KxHy(C2O4)z .nH2O, was dissolved in water to make 250cm3 of solution. 25cm3 of this solution was pipetted into a conical flask followed by an equal volume of 1M sulphuric acid and the mixture heated to 70oC. The hot solution required 31.75cm3 of 0.02M potassium manganate vii solution to reach end point.

Question

2g of a compound Q ,KxHy(C2O4)z .nH2O, was dissolved in water to make 250cm3 of solution. 25cm3 of this solution was pipetted into a conical flask followed by an equal volume of 1M sulphuric acid and the mixture heated to 70oC. The hot solution required 31.75cm3  of 0.02M potassium manganate vii solution to reach end point.
Another 25cm3 of the same solution of compound Q, required 23.8cm3 of 0.1M sodium hydroxide solution to reach end point with phenolphthalein indicator.
Calculate the molarity of the solution in terms of y and z, and hence determine the values of x,y,z and n.

NDAYISABYE VEDASTE · Answer

x=2, y=2; z=1; n=2