mole concept

a) A 2.36 g sample of dolomite containing CaC03 and MgC03 were dissolved in 700 ml_ of
decinormal solution of HCI. The solution was diluted to 2.5L and 25mL of this solution required 20 mL 0.01 N NaOH solution for complete neutralisation. Compute the composition of the ore.
b) A sample of hydrazine sulphate (N2H6S04) was dissolved in 100 mL water 10mL of this solution was reacted with excess FeCI3 solution and warmed to complete the reaction. Ferrous ion formed was estimated and it required 20 ml of M/50 KMn04 solution. Estimate the amount of sulfate in one litre of solution.

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