Lab 12 - Measuring Enthalpy Changes

7 repeat steps 1 through 6 with solid nh4no3 in place

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Unformatted text preview: with deionized www.webassig n.net/ebooks/wsug encheml1/lab_12/manual.html 4/7 4/15/13 Lab 12 - M easur ing Enthalpy Chang es water and dry. 7 Repeat steps 1 through 6 with solid NH4NO3 in place of the solid CaCl2. 8 Calculate the ΔT for each reaction and record them in Table A. Part B: Heat of Reaction - FeCl3(aq) + NaOH(aq) 1 Take two test tubes to the side shelf and obtain about 1 mL of 1 M FeCl3 in one and about 1 mL of 1 M NaOH in the other. 2 Measure the temperature of the FeCl3 solution, and note its color. Enter this information in Table B. 3 Add the 1 M NaOH to the FeCl3 test tube. 4 Place the thermometer in the test tube containing the mixture. Watch the temperature change on the thermometer. Record the maximum or minimum temperature reached in Table B. 5 Record the appearance of the reaction mixture in Table B. 6 Calculate the ΔT for the reaction and record it in Table B. 7 When finished, dispose of your solution as directed by your instructor. Use water in a squeeze bottle to rinse the solid material out of the test tube and then wash the tube with soap and water. Part C: Heat of Neutralization - NaOH + HCl, NaOH + HNO3, NaOH + HC2H3O2. 1 Add 2 mL of 0.1 M NaOH to e ach of 4 test tubes. Add 1 drop of phenolphthalein to each tube. 2 Measure the temperature of one of the NaOH solutions and record it in Table C. Note the appearance of the solutions in Table C. Assume that all the NaOH solutions in this experiment start out at this temperature. 3 Measure 3 mL of deionized water in a graduated cylinder and add it to the first test tube. Record the maximum or minimum temperature reached and any change in appearance in Table C. 4 Measure 3 mL of 0.1 M HCl in a graduated cylinder and add it to the second test tube. Record the maximum or minimum temperature reached and any change in appearance in Table C. 5 Measure 3 mL of 0.1 M HNO3 in a graduated cylinder and add it to the third test tube. Record the maximum or minimum temperature reached and any change in appearance in T...
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