A Standard solution of KMnO4 May be used to determine the Fe*2+ content of an...

A Standard solution of KMnO4 May be used to determine the Fe*2+ content of an inorganic salt.
G is 0.500molperdm*3 KMnO4 solution
H is an Fe*2+ solution containing 78.5g of (NH4)2 SO4. FeSo4.xH2Operdm*3 . 20cm*3 of H was pipetted into a conical flask acidified with 10cm*3 of dilute H2SO4. the result are recorded in the table

burrette reading 1. 2. 3
initial reading. 20.00. 40.00. 20.00
final reading . 0.00. 20.00 0.00
Volume of G. 20.00. 20.00. 20.00

the equation for the reaction in the titration
Mno4+ 5Fe*2+8H^+= Mn^2+ + 5Fe^2+ + 4H2O

a). from your result and information provided, calculate
I) average volume of acid
ii) concentration of Fe^2+ in solution H molper dm^3

III) the concentration of the anhydrous salt in H in gram per dm^3

iv) the value of x in the hydrated salt
[ H=1 , N=14 , O=16 S=32 Fe=55]

b) explain why HCl can't be used to provide an acidic medium in titration involving KMnO4

ii) explain briefly why (NH4)2.Fe(So4)2. 6H20 is used in preference to Feso4 in standardising KMnO4 solution?

In Chemistry
6 Answers Available
Asked by Samuel on 22nd March, 2020