Writing More Complex Redox Equations

Writing more complex Redox Equations Aim: To be able construct ionic half equations for reactions involving complex ions.

Starter ,[object Object],HBr + NaHSO 4 Redox? Yes or no? 2HBr + H 2 SO 4 SO 2 + Br 2 + 2H 2 O Half ionic equations? Oxidation number?

Starter: NaI with Sulphuric acid ,[object Object],[object Object],Redox? – Strength of reducing agent?

Starter Disproportionation ,[object Object],[object Object],[object Object]

Disproportionation 2 ,[object Object],[object Object],[object Object]

Disproportionation 3 ,[object Object],[object Object],[object Object],[object Object]

Redox reactions – Potassium Permanganate and Sodium thiosulphate. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Reaction between MnO 4 - and S 2 O 3 - wine into water! ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Reduction of the Manganate ion MnO 4 - ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Oxidation of the Thiosulphate ion to Tetrathionate ion. ,[object Object],[object Object],[object Object],[object Object]

Overall redox equation ,[object Object],[object Object]

Ionic half equation for the reduction of the dichromate ion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Some examples ,[object Object],[object Object],[object Object],[object Object],[object Object]

Answers ,[object Object],[object Object],[object Object],[object Object]

Reaction between Iodine and Sodium Thiosulphate ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],I 2 + 2e -1 2I -1 2S 2 O 3 -2 S 4 O 6 2- + 2e -

A Redox Titration 0.01M sodium thiosulphate 10ml of 0.01M I 2 ,[object Object],[object Object],[object Object]

Titration Results. Titre cm 3 Burette reading initial Burette reading final 4 3 2 1 Burette readings

Interpreting the Results ,[object Object],[object Object],[object Object],[object Object],[object Object]

Redox questions ,[object Object],[object Object],[object Object],[object Object]

Further redox questions – separate into half ionic equations ,[object Object],[object Object]

Home work ,[object Object],[object Object],[object Object]

Writing More Complex Redox Equations

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Writing More Complex Redox Equations