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Add water to a small sample of the fertilizer in a test tube and shake well. Filter to obtain a solution. To the solution add some freshly prepared ion (II) sulphate solution and shake well. With a test tube in a slanting position, add concentrated sulphuric (VI) acid to the mixture carefully along one side of the tube. A brown ring between two layers indicates the presence of nitrate ions.
0714212817 answered the question on March 21, 2018 at 04:10
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