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

Answered by Collette G. Chemistry tutor

2064 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

Without calculation, predict (giving you reasoning) whether the entropy change for the following reaction will be significantly positive, significantly negative or approximately zero: MgO(s) + CO2 (g) --> MgCO3 (s)


Explain why transition metal compounds are often coloured in solution.


What is the difference between London dispersion forces and hydrogen bonds?


Which test would you use to identify the difference between an aldehyde and a ketone? Explain your observations.


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