How do I do redox calculations?

For example,Iron(II) sulphate can be oxidised using acidified potassium permanganate solution. Calculate the mass of iron(II) sulphate which will completely react with 200 cm3 of 0.25 mol l-1 acidified permanganate solution.
Write the redox equation:-2MnO4- + 16H+ + 5Fe2+ à 2Mn2+ + 8H2O + 5Fe3+
Calculate the number of moles of the ‘known’ reactantNo. of moles = C x V(litres)= 0.25 x 0.2 = 0.05 mol
Use: mole ratio in equation to calculate the number of moles ofthe ‘unkown’ reactant.0.05 mol of MnO4- reacts with 5/2 x 0.05 = 0.125 mol of Fe2+
Use: mass = no. of mole x gfm to calculate the mass of iron(II) sulphate Mass of FeSO4 = number of moles x gfmMass of Fe SO4 = 0.125 x152 = 19g

CG
Answered by Collette G. Chemistry tutor

2149 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

What is an acid-base pair?


Using your knowledge of periodicity and atomic structure, why does the first ionisation energy decrease moving down a group yet increase moving along a period in the periodic table?


What is the difference between empirical and molecular formula?


How would you synthesise an carboxylic acid just from a primary haloalkane like bromoethane?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences