1. Many of the reactions use 1 mL of solution. How can you estimate this volume?
ID: 542835 • Letter: 1
Question
1. Many of the reactions use 1 mL of solution. How can you estimate this volume? 2. Do you need to dry the test tubes before using them for the reactions in this experiment? Why or why not? 3. The following reactions are performed, and the results are shown below. Use these results to determine the relative activities of the two elements involved in each reaction next to that reaction. Then place the elements gold, hydrogen, zinc and tin in an activity series in order of decreasing activity. Sn (s) + HCl (aq) H2(g) + SnCl2 (aq) Au (s) + Sn(NO3)2 (aq) NR Au (s) + HCl NR Zn (s) + Sn(NO3)2 (aq) Zn(NO3)2 (aq) + Sn (s) least active most active (most easily oxidized) Now use the above results to write products for the reactions below. Write NR if no reaction is expected. Sn (s) + Zn(NO3)2 (aq) Zn (s) + Au(NO3)3 (aq)Explanation / Answer
1. Most of the reactions uses 1mL solutions. In generally there are different methods to determine volume of solvent or solutions. But for small amounts and for accuracy of measurements a syringe or a graduated cylinder can be used. In these syringes are more preferable. For general use 1mL pipette also be used.
2. Yes, we need to dry the test tube before going to put a reaction. Because of drying we can eliminate moisture from the tubes. Otherwise the moisture can causes side reactions with the reagents we used. Also if any polar molecules or ionic compounds are there then they can easily react with moisture. So to eliminate these we have to dry the test tube before going to put a reaction.
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