Objective Determine the equilibrium constant Kc for the chemical reaction: Fe3+(aq) + SCN–(aq) ⇌ FeSCN2+(aq) Procedure 0.0020M Fe(NO3)3 (ml) 0.0020M KSCN (ml) H2O (ml) 5 2 3 5 3 2 5 4 1 5 5 0 18 (0.2M) 2 0 (1) Calibrate the colorimeter. (2) Prepare five test tubes with the designated solutions: (3) Measure each solution using the colorimeter and computer software. (4) Record an observation of the solution temperature. (5) Calculate the average equilibrium constant for the reaction […]
Safety note (tert-butyl alcohol / tert-butanol, CAS 75-65-0): PubChem’s hazard summary for tert-butanol (CID 6386, CAS 75-65-0) classifies it as a highly flammable liquid and vapour (H225), as causing serious eye irritation (H319), as harmful if inhaled (H332), and as possibly causing respiratory irritation (H335). This lab belongs in a fume hood, away from ignition sources, with eye protection and gloves; see also a manufacturer SDS such as Fisher Scientific tert-Butanol. Analysis: Utilizing the Lab Pro software, we were […]
In Galileo’s Dialogues Concerning Two New Sciences, he notes that a ball rolling down a uniform incline accelerates uniformly. Unfortunately, the most accurate tool to available to Galileo was a water clock, and this experiment has been designed to confirm his results using more-precise measurements from a motion detector and computer software. Similar to previous experiments, a test-cart was observed in motion down an incline track and using the Logger Pro software, precise graphical representations were created. Data Table for […]
Analysis of Vitamin C in Juice Product, Data in Slides 12-14 (1) Molarity of Standard Ascorbic Acid Solution Standard Solution of AA = (0.05 (g AA/100mL) x 1000mL)/176.1(g AA/mol) = 2.84 x 10-3 M (2) Molarity of DCP Solution Standard Solution of DCP = (2.84×10-5mol DCP/33.57mL DCP) x 1000mL = 8.50×10-4 M in Trial 1 (3) Mass of Ascorbic Acid Titrated in Juice Sample Ascorbic Acid Mass Titrated in Juice = ((8.5×10-4) mol DCP/1000mL) x (13.61 mL DCP) x (176.1 […]
Objective: The purpose of this experiment is to determine an unknown diprotic acid by examining its molecular weight using titration. Procedure: (1) Dissolve 0.120 g of the unknown in 100 mL of distilled water. (2) Place the 250 mL beaker ontop of a magnetic stir plate, and suspend a pH electrode into the solution using a ring stand. (3) Fill buret to 0 mL level with sodium hydroxide, prepare computer software. (4) Wait for pH to stabilize then keep data […]
Introduction: Isaac Newton’s Third Law of physics states that for every action there is an equal and opposite reaction. This principle describes interactions between bodies, and an experiment has been conducted to study these relations. In the following, two Force Sensors were utilized in connection with computer software to observe and generate graphical data for such interactions. Analysis: (1) Examine the two data runs. What can you conclude about the two forces? How are the magnitudes related? How are the signs […]