Standardisation of silver nitrate solution

Colour change at end-point Further data of interest 

Yellowish-green - pink Soluiion must be neuiral or weakly basic 

Pink - reddish-violei Besi in acetic (eihanoic) acid solution useful down io pH 1-2 

Colourless solution - green solution Sharp colour change in I + Cl back-tiiraiion 

Orange- pink - reddish-violei Best in dilute (up io 0.3M) HN03 

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The indicator electrode must be reversible to one or the other of the ions which is being precipitated. Thus in the titration of a potassium iodide solution with standard silver nitrate solution, the electrode must be either a silver electrode or a platinum electrode in the presence of a little iodine (best introduced by adding a little of a freshly prepared alcoholic solution of iodine), i.e. an iodine electrode (reversible to I-). The exercise recommended is the standardisation of silver nitrate solution with pure sodium chloride. 

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