Chemistry practical 8 - measuring the EMF of an electrochemical cell 0.0 / 5 ? ChemistryElectrode potentialsA2/A-levelAQA Created by: jamey_brewsterCreated on: 27-04-19 10:22 What must be done to the copper plates before starting the experiment? Cleaned and degreased using cotton wool and propanone 1 of 14 What is used for the salt bridge? ***** of filter paper soaked in saturated potassium nitrate solution 2 of 14 What is the purpose of the salt bridge? Completes the electrical circuit by allowing ions to move between the solutions. 3 of 14 What should the salt bridge be unreactive with? The electrodes and electrode solutions 4 of 14 Why is a wire not used? The metal wire would set up its own electrode system with the solutions. 5 of 14 What must be used in a half cell if there is no conducting metal? An inert platinum electrode 6 of 14 Why is a a platinum electrode used? It is unreactive and can conduct electricity 7 of 14 Which solution can be used in a copper electrode? CuSO4 8 of 14 Which solution can be used in an iron (III) electrode? Fe2(SO4)3 9 of 14 Which solution can be used in an iron (II) electrode? FeSO4 10 of 14 Does the better reducing agent have a more +ve or more -ve electrode potential? -ve 11 of 14 Does the better oxidising agent have a more +ve or more -ve electrode potential? +ve 12 of 14 Should the EMF of a cell be +ve or -ve for the reaction to be feasible? +ve 13 of 14 How is EMF calculated? E(RHE)-E(LHE) 14 of 14
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