Answer to Question #153312 in Physical Chemistry for Djoukang Temfack Samanta Samira

Question

A standard solution of hydrated Iron (II) sulphate, FeSO4.xH2O, as prepared by dissolving 5.8g of the salt in a volumetric flask making it to 250ml (250 cm3), 25ml (25 cm3) of this solution was acidified and found to react with 22.8ml (22.8 cm3) of 0.018MPotassium permanganate solution.

Calculate:

i)The concentration (moldm3) of the Iron(II) salt

ii)The number of moles of the salt in 250 cm3 of solution.

Answer 1

1) C(FeSO4)=0,1642М=0,16М - the concentration in a volumetric flask

2) n(FeSO4)=0,16*0,25=0,04 mole - the number of moles of the salt