chem 101 lab 2

chem 101 lab 2 - Experiment 3 Sensors and Chemical...

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Experiment 3 – Sensors and Chemical Reactions Fall 2007 Name Emily Winslett Lab Day and Time Tuesday, 1:00 TA Duy Le Section 409 Documentation Kenan Hill (lab partner), Lab Manual, Pre-Lab Lecture Grading Rubric Possible Points Points Received Introduction 20 Balanced equations including states Materials and Methods 10 Only describe deviations Reference lab manual Results and Discussion 50 Inserted titles for tables Inserted graphs into template Inserted captions for each graph Showed complete sample calculations Summarized all data in tables Answered questions correctly Uses experimental data to clearly expresses how temperature is related to density Error analysis Laboratory Technique 20 TOTAL (100) TA Comments/Suggestions:
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C HEMISTRY 11L R EPORT T EMPLATE EXPT. Sensors and Chemical Reactions 3 Introduction The purpose of this report is to classify and describe the following reactions: H 2 O (l) + NH 4 Cl (s) NH 4 + (aq) + Cl - (aq) + H 2 O (l) H 2 O (l) + Na 2 CO 3 (s) 2Na + (aq) + CO 3 2- (g) + H 2 O (l) 3NaHCO 3 (s) + H 3 C 6 H 8 O 7 (aq) 3CO 2 (g) + 3H 2 O (l) + Na 3 C 6 H 5 O 7 (aq) Mg 2+ (s) + 2HCl - MgCl 2 (aq) + H 2 + (g) CaCO 3 (s) + 2HCl - (aq) CaCl 2 (aq) + H 2 O (l) + CO 2 (g) Mg(OH) 2 (s) + 2HCl - (aq) 2H 2 O (l) + MgCl 2 (aq) The objective of the experiment was to use the temperature sensor and pH sensor to monitor the progression of various types of reactions. Materials and Methods The procedure for this experiment was taken from the Chemistry 101L Lab Manual for Experiment 3. There were no deviations from the given procedure, all steps were followed as written. Results and Discussion The first part of the experiment consisted of measuring the temperature change for the dissolution of ammonium chloride and sodium carbonate in water. The raw data for these experiments are summarized in Data Table 1. Data Table 1. Mass and Temperature of Ammonium chloride and Sodium carbonate reacting with Water Ammonium chloride Sodium carbonate Mass (g) 1.008 1.067 Initial Temperature ( o C) 22.5 22.7 Final Temperature ( o C) 21.5 23.3 To compare the heat of solution for the two reactions, the final analysis must be expressed in similar units. In this experiment, the heat of solution will be expressed as the change in temperature per mole of
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chem 101 lab 2 - Experiment 3 Sensors and Chemical...

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