Zinc and Copper(II) Sulfate Materials: Two test tube rack, 1 M CuSO_4 (copper(II
ID: 505843 • Letter: Z
Question
Zinc and Copper(II) Sulfate Materials: Two test tube rack, 1 M CuSO_4 (copper(II) sulfate notation). Zn(s) For all the experiments in pans C-F, use small quantities. For solids, use the amount of compound that will fit on the tip of a spatula or small scoop. Carefully pour small amounts of liquids into your own beakers and other container. Measure out 3 ml, of water in a test tube. Use this volume as a reference level for each of the experiments. Do not place droppers or stirring rub into reagent bottles. They may contaminate a reagent for the entire class. Discard unused chemicals as indicated by your instructor. Pour 3 ml. (match the reference volume) of the blue solution. 1 M CuSO_4 (one molar copper(II) sulfate), into each of two test tubes. Obtain a small piece of zinc metal. Describe the appearance of the CuSO_4 solution and the small piece of zinc metal. Add the Zn metal piece to the CuSO_4 solution in one of the test tubes. The CuSO_4 solution in the other test tube it your reference for the initial solution color. Place the test tubes in your test tube rack and observe the color of the CuSO_4 solutions and the Zn piece again at 15 and 30 minutes. Pour the CuSO_4 solutions into the sink followed by a large amount of water. Rinse the piece of zinc with water and place it in a recycling container as directed by your instructor. B.2 Balance the equation given for the reaction. The symbol (aq) means aqueous (dissolved in water). Unbalanced equation: Zn(s) + CuSO_4(aq) rightarrow Cu(s) + ZnSO_4(aq) B 3 Identify the type of reaction that that occurred. Metals and HCl Materials: Three test tubes, test tube rack, small pieces of Cu(s), Zn(s), and Mg(s) metal 1 M HCl Caution: HCl it a carrot ire acid. Handle carefully! C.l Place 3 mL of I M HCl (match your reference volume from part Cu(s) in each of three test tubes. Describe the appearance of each metal. Carefully add a metal piece to the acid in each of the test tubes. Record any evidence of reaction such at bubbles of gas (H_2). Carefully pour off the acid and follow with large quantities of water to dilute. Rinse the metal pieces with water, dry, and return to your instructor C.2 Balance the equation given for each metal that gave a chemical reaction. If there was no reaction, cross out the products and write NR for no reaction. Unbalanced equations: 1.Cu(s) + HCl(aq) rightarrow CuCl_2(aq) + H_2(g) 2. Zn(s) + HCl(aq) rightarrow ZnCl_2(aq) + H_2(g) 3. Mg(s) + HCl(aq) rightarrow MgCl_2(aq) + H_2(g) C.3 Identify the type of reaction for each chemical reaction that occurred. Reactions of Ionic Compounds Materials: Three (3) test tubes, test tube rack Dropper bottle sets of 0.1 M solutions: CaCl_2, Na_3PO_4, BaCl_2, Na_2SO_4, FeCl_3, KSCN For each of these reactions, two substances will be mixed together. Describe your observations of the reactants before you mix them and then describe the products of the reaction. Look for changes in color, the formation of a solid (solution turns cloudy), the dissolving of a solid, and/or the formation of a gas (bubbling). Balance the equations for the reactions. Dispose of the solutions properly. D.1 Place 20 drops each of 0.1 M CaCl_2 (calcium chloride) and 0.1 M Na_3PO_4 (sodium phosphate) into a test tube. Describe any changes that occur. Identify the type of reaction for each chemical reaction that occurred. Unbalanced equation: CaCl_2(aq) + Na_3PO_4(aq) rightarrow Ca_3(PO_4)_2(s) + NaCl(aq).Explanation / Answer
For the given reactions,
B.1. CuSO4 (aq) is blue in color
Zn(s) is greyish-black in color
B.2. Balanced equation,
Zn(s) + CuSO4(aq) --> ZnSO4(aq) + Cu(s)
B.3. Type of reaction : Redox reaction (single displacement reaction)
1 mole of Zn reduces 1 mole of Cu2+ in CuSO4 to Cu(s) metal and itself gets oxidized to Zn2+ in ZnSO4.
C. Metal and HCl
C.1. Zn(s) greyish-black color
Mg(s) greyish color
Cu(s) is reddish brown color
C.2. Evolution of H2 bubbles seen in 2, and 3. No reaction with Cu + HCl.
Balanced equation,
1. Cu(s) + 2HCl(aq) ---> NR
2. Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(aq)
3. Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(aq)
C.3. type of reaction : single displacement (dissolution)
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