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(a) The elements nitrogen, phosphorous and potassium are essential for plant growth.
(i) Potassium in fertilizers may be in the form of potassium nitrate.
Describe how a sample of a fertilizer may be tested to find out if it contained nitrate ions.
(ii) Calculate the mass of nitrogen present if a 25kg bag containing pure ammonium phosphate ,
#(NH_4)_2HPO_4#. (N= 14.0, H=1.0, P=31.0,O=16.0)