... comes over around 2 cm above the rim and fold this projection down over the rim of the beaker, clamping it into position with a crocodile clip attached to a lead. ==> Pour about 20 cm3 of the appropriate salt solution so each metal strip is immersed in a solution of its ions (for example zinc sulphate in the beaker with the zinc metal in). ==> Make a salt bridge by immersing a strip of filter paper in saturated potassium nitrate solution and let the excess solution drain off it before using it. ==> Connect the electrodes to a high resistance voltmeter and complete the circuit with the salt bridge. (See diagram). Make sure the 2 electrodes are connected to the correct terminal of the voltmeter - the more reactive/ better reducing agent at the negative terminal (on the left) and the less reactive/ better oxidising agent at the positive terminal (on the ...

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