Rubenstein_Exp4

Rubenstein_Exp4 - Experiment 4 Sensors and Chemical...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Experiment 4 – Sensors and Chemical Reactions Fall 2009 Name Alec Rubenstein Lab Day and Time 9/28/09; 1:00 PM TA Tom Martz Section 403 Documentation Lab Manual: Experiment 4, Lab Partner: Lindsay Casper 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 Error analysis Laboratory Technique 20 TOTAL (100) TA Comments/Suggestions:
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
C HEMISTRY 101L R EPORT T EMPLATE EXPT. Sensors and Chemical Reactions 4 Introduction The purpose of this report is to classify and describe the following reactions: NH 4 Cl (s) + H 2 O (l) ----> NH 4 + (aq) + Cl - (aq) + H 2 O ( l ) NaHCO 3(s) + H 2 O (l) = H 2 CO 3(ag) +OH - (aq) + Na + (aq) Na + HO O O - Sodium Bicarbonate Na + Na + Na + OH O O - O O - O - O Sodium Citrate C O O Carbon Dioxide H O H Water OH O OH O OH O HO Citric acid Mg (s) + 2HCL (aq) -> MgCl 2(aq) + H 2(g) CaCO 3(s) + 2HCl (aq) -> CaCl 2(s) + H 2 0 ( l ) + CO 2(g) Mg(OH) 2(s) + 2HCl (aq) -> MgCl 2(aq) + 2H 2 O (l) The objective of the experiment was to use 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 Lab Manual: Experiment 4. There were no deviations from the Lab Manual. 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. Ammonium chloride Sodium carbonate Mass (g) 1.011 g 1.036 g Initial Temperature ( o C) 22.0 o C 22.3 o C Final Temperature ( o C) 19.7 o C 24.1 o C
Background image of page 2
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 solute, expressed in the units of o C/mol. Data Table 2. Moles, Change in Temperature & T/mol for Ammonium chloride & Sodium carbonate dissolution reactions Ammonium chloride Sodium carbonate Moles (mol) 1.9 x 10 -2 9.77 x 10 -3 Change in Temperature ( o C) 2.3 o C -1.8 o C T/mol ( o C/mol) 1.2 x 10 -2 -1.8 x 10 2 Sample Calculations: Ammonium chloride dissolution The dissolution of most salts is an endothermic process as is the case when dissolving ammonium
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

Rubenstein_Exp4 - Experiment 4 Sensors and Chemical...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online