Lab S-3 Solid Copper in Silver Nitrate Solution Objectives 1a,8,9 lab objectives 1-4 5. Observe the setup for a few minutes and note any changes. BACKGROUND: In this lab you will determine the relationship Let the setup sit overnight in the back cabinet as directed by between moles of solid copper and silver. You will find the your teacher. mass of silver nitrate and prepare a solution of it, you will then find the mass of copper before placing it into the solution of NEXT DAY silver nitrate and then observe what happens. At the end of the experiment you will find the mass of the copper wire and with 6. Now mass a piece of filter paper. Fold it as the instructor has that information you will be able to determine quantitative demonstrated and place it into the funnel and moisten it with relationships in the lab. distilled water to allow it to adhere the glass. Remember that copper is an element made of only one kind of atom, while silver nitrate is a compound made of silver 7. Obtain the test tube from the back cabinet and again note atoms bonded to a radical group called nitrate. Also remember your observations. Record your observations in your lab write that a chemical reaction involves bond breaking and making (lab up. 6) and radicals stick together through think and thin, therefore the radical will not break apart during this reaction. 8. Remove the rubber stopper and shake off as many of the crystals as possible. I wonder what they are? Using your plastic PROCEDURE spoon scrape as many of the adhering crystals as possible onto the filter paper. 1. Obtain a piece of copper, clean it with emery cloth and weigh it. Record this mass on your data table. 9. Set up a filtration system as you did in lab 7, be sure to know the empty weight of the beaker collecting the filtrate. Pour all 2. Weigh out ABOUT 3.00 g of silver nitrate. Place this solid the contents of the test tube into the filter paper, including the into a small beaker and add 10 ml of distilled water. Mix until crystals. Any crystals that stick to the sides of the test tube can all the solid is dissolved. WARNING: SILVER NITRATE be rinsed out with the wash bottle of distilled water. Be sure to WILL TURN YOUR SKIN AND CLOTHING BLACK!!! collect the filtrate in a beaker. Remove the beaker under the BE CAREFUL. funnel when all the filtrate has moved through it.

3. Pour the silver nitrate solution into an 18x150 test tube. 10. Mass another beaker and place the filter paper with the Rinse the beaker twice, with about 3-4 ml distilled water and add crystals into it. Place this beaker into the drying oven overnight. this to the test tube also. Add distilled water to the test tube until Remember to write your name on the beaker. 3/4 of the copper wire is covered. Stir and rinse off the stirring rod into the solution as well. 11. Dip the copper wire into a test tube of acetone located at the front desk and air dry. 4. Put the copper wire into the solution, add a 1-hole stopper that fits the test tube and make sure the wire emerges through the 12. Weigh the dry copper wire and record the mass in your data hole. Hint: look at the diagram below: table.

copper wire 13. If time permits, carefully boil the liquid off. Do not cook like Mrs. Foerster, it will burn. If this does occur, quickly take the beaker, using beaker tongs, to the hood and turn it on until ring stand the smoke subsides. Mass the beaker when dry and cool. 1-hole stopper NEXT DAY

14. Remove the beaker from the oven, allow it to cool until you can hold it in your hand and weigh it. Record this mass in the test tube clamp data table. Return the crystals to the instructor for reclamation, 18x150 test throw the filter paper away. tube

silver nitrate solution Lab S-3 Solid Copper in Silver Nitrate Solution

HINTS: A data table consists of everything that has been measured in QUESTIONS lab, does yours? You should have data that allows you to 1. Is mass conserved within experimental uncertainty? determine: A. mass of copper used 2. What do the simple whole numbers represent in calculation B. mass of crystals made #10? C. mass of filtrate 3. Recalling from lab 7 and question 1, if mass is conserved CALCULATIONS what else is conserved?

1. Find the mass of the filtrate. 4. Using the logic from question 3 write the formula of the filtrate (stuff in the blue solution). 2. Find the mass change in the copper wire. 5. What causes the blue color in the solution after the reaction is 3. Find the mass of crystals produced. completed?

4. Find moles of copper that reacted. 6. What are the particles remaining in the water solution at the end of the reaction, atoms, radicals or ions? 5. Find moles of silver produced.

6. Find the ratio: moles Ag moles Cu

Write your answer in decimal form. Use sig. figs. to alleviate uncertainty.

7. Find moles of silver nitrate used in the reaction.

8. Find the ratio: moles Ag moles silver nitrate

Write your answer in decimal form and use sig. figs.

9. Using the results from calculations 6 and 8 fill in the coefficients in the following equation: (it is o.k. if they are not whole numbers)

1 mole Cu (solid) + ____ mole(s) AgNO3 (solution) ------> ___ mole(s) silver (solid) + ___ mole(s) blue solution

10. From the video of the one armed magnet man and what you know about chemical equations from lab 6 & 7, rewrite the equation in calculation #9 using simple whole numbers.

11. Find the ratio: sum of masses of products sum of masses of reactants