Cation and Anion Report

1449 Words6 Pages
Name: Melody Wong N8426066 Cation and Anion Reaction 1. Objectives Educational Aims * To learn how to set up a practical experiment * To compare experimental results with the theoretical results and explain any discrepancies. Experimental Aim * To examine the reaction between cations and anions 2. Theory A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Chemical reactions occur whenever bonds are formed or broken between molecules. Chemical reactions can be classified into a few categories. In this experiment, we are going to observe double replacement reaction. In a double replacement reaction, parts of two compounds switch places to form two new compounds, This is when the anions and cations of two different molecules switch places, forming two entirely different compounds. These reactions are in the general form: AB + CD → AD + CB Reactions between cations and anions will be examined in this experiment. The resulting precipitate is indicative of the reaction that occurred. In our experiment, a lead nitrate solution, Pb(NO3)2, will be mixed with a solution of potassium chromate, K2CrO4. A yellow precipitate will form. This precipitate must be a combination of the K + or Pb 2+ cation and the CrO4 2- or NO3 2- anion. Since most potassium salts and nitrates are soluble in water, PbCrO4 must be the precipitate. The equation for this reaction is: Pb2+ (aq) + CrO4 2- (aq) PbCrO4 (s) Equipment: * 100 mL beaker * 250 mL Erlenmeyer flask * Buchner funnel * Stirring rod * Measuring cylinder * Test tube * Electronic balance Material: * 1.0 M Potassium chromate solution * 1.0 M Lead (II) nitrate solution 3. Procedure Step 1 50mL of 1.0 M Potassium Chromate solution is added in a 100 mL beaker. Step 2 50mL of 1.0 M Lead(II) Nitrate
Open Document