Rubenstein_Exp5 - Experiment 5 Conductometric Titration...

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Experiment 5 – Conductometric Titration Fall 2009 Name Alec Rubenstein Lab Day and Time 10/5/09; 1:00 PM TA Tom Martz Section 403 Documentation Lab Manual: Experiment 5, Lab Partner: Lindsay Casper Grading Rubric Possible Points Points Received Introduction 10 Purpose of report Goals of the experiment Materials and Methods 20 Describe procedure in paragraph format following guidelines provided (-2 for each type of mistake) 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 completely Error analysis Laboratory Technique 20 TOTAL (100) TA Comments/Suggestions:
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C HEMISTRY 101L R EPORT T EMPLATE EXPT. Conductometric Titration 5 Introduction The purpose of this report is to determine the empirical formula of calcium phosphate and compare the concentration of calcium and phosphate ions over time during the calcium hydroxide- phosphoric acid reaction. The objective of the experiment was to use a conductometric titration to measure the ion concentration in the solution during the acid-base reaction. Materials and Methods A cap was placed on the weighing bottle full of dried calcium hydroxide taken from the sealed dessicator. The mass of the weighing bottle with calcium hydroxide was measured using an analytical balance. Approximately 0.05 grams of calcium hydroxide were transferred to a 250 mL volumetric flask. By reweighing the weighing bottle, the exact mass of calcium hydroxide in the volumetric flask was determined. The mass of the calcium hydroxide sample was 0.052 g. The 250 mL volumetric flask was filled halfway with distilled water and then swirled and inverted for five minutes. More distilled water was added to the volumetric flask until it reached the water line. The volumetric flask was then inverted and swirled ten times. Using a 25 mL volumetric pipet, 50 mL of the calcium hydroxide solution was transferred into a 100 mL beaker. A buret was then filled with a 0.01635 M solution of phosphoric acid. Using a three pronged clamp, the conductivity sensor was placed into the beaker of calcium hydroxide solution without interfering with the stir bar placed in the beaker’s base. Data studio was started and an initial reading of the calcium hydroxide solution’s conductivity was taken. Phosphoric acid was then titrated into the calcium hydroxide solution in approximately 0.5 – 1.0 mL increments and the solution’s conductivity was measured using data studio approximately 1 minute after each titration. Twelve titrations were made in total and data studio was not stopped until several titrations were made after the solution’s conductivity reading reached its minimum. Next, three sensitive trials were completed. A clean 100 mL beaker was filled with 50 mL of calcium hydroxide solution using the 25 mL volumetric pipet. The beaker was titrated with 2-3 mL increments of phosphoric acid until the solution’s
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Rubenstein_Exp5 - Experiment 5 Conductometric Titration...

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