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Pb(NO3)2 + 2KI --------> 2KNO3 + PbI2 (yellow precipitate) When Potassium iodide is added in a solution of lead (II)nitrate a double displacement reaction takes place và produces lead (II) iodide and potassium nitrate. Potassium nitrate is water soluble trắng solid whereas lead (II) iodide is precipitated out as yellow solid.