Solution B containing 11.75g of ammoniumiron(II)sulphate, (NH4)2Fe(SO4)2.6H2O dissolved in 500 cm3of solution.
Solution C containing 1.25g of a dibasic acid, H2X. 2H2O dissolved in 250cm3 of solution.
You are required to:
Standardize solution A using solution B.
Use the standardized solution A to determine the concentration of solution C.
Determine the molecular mass of X.
Fill the burette with solution A.Using a pipette and pipette filler, place 25 cm3of solution B into a 250 ml conical flask. Titrate solution A with B until a permanent pink colour just appears.Record your results in table 1 below. Repeat this procedure two more times and complete table 1.
Final burette reading, cm3
Initial burette reading, cm3
Volume of solution A used, cm3
Calculate the average volume of solution A used. (1 mark)
Calculate the concentration of B in moles per litre. (RFM of B is 392) (1 mark)
Calculate the number of moles of iron (II)ions in the 25 cm3 of solution B. (1 mk)
Calculate the concentration of manganate(VII)ions in solution A in moles per litre given: (1 mk)
Pipette 25 cm3 of solution C into a conical flask. Heat this solution to about 70 C and titrate the hot solution C with solution A in the burette until a permanent pink colour just appears. Shake thoroughly during titration. Record your results in table II. Repeat this procedure to complete table II.