zalles_Exp5 - Experiment 5 Conductometric Titration Spring...

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Experiment 5 – Conductometric Titration Spring 2010 Name Nicole Zalles Lab Section 414 Point Summary (See Blackboard for detailed grading rubric) Superior Excellent Satisfactory Fair Poor Omitted Introduction •Purpose of Report •Goals of Experiment Materials and Methods Results and Discussion •Description of data •Data Tables •Data Table Titles •Graphs •Figure Captions •Sample Calculations •Systematic Error •Random Error •Discussion of discrepancies Other Lab Technique TOTAL POINTS 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 understand and observe the law of the conservation of matter, writing out and balancing chemical equations, and observing how conductivity can be used to follow the progress of a chemical reaction. The objective of the experiment was to use a conductometric titration to determine the molar ratio, and thus the empirical formula of calcium phosphate; calculating the number of moles of calcium and phosphate from the titration, we compare the different number of moles and we can determine the molar ratio of calcium to phosphate. The reference used in the overall procedure and analysis is in the Chem 101L Laboratory manual; Spring 2010, Experiment 5. Materials and Methods Materials: Weigh Bottle (w/lid) Electronic Balance 250mL Volumetric Flask 100mL Beaker 25mL Volumetric Pipet Pipet bulb Buret Conductivity sensor 3-prong clamp Stir Bar Stir Plate Dried (anhydrous) Calcium hydroxide (Ca(OH) 2 ) Distilled water Phosphoric acid solution (H 3 PO 4 ) Procedure: I) Gross Data Collection 1) Taking out the weigh bottle with the dried calcium hydroxide from the dessicator, weigh the bottle using the electronic balance without the lid and record its mass in Data Table 1 (be sure to cover the bottle as quickly as you can so the sample remains anhydrous). 2) Measure out about .05g of the anhydrous calcium hydroxide into the 250mL volumetric flask, reweighing the bottle after addition of the sample to the flask to obtain a final mass of the weigh bottle with the sample to determine how many grams of calcium hydroxide have been emptied into the flask. Record this final mass. 3) Fill the volumetric flask about half way with distilled water. Swirl the mixture to begin to dissolve the solute; do so for about 5 minutes. 4) After the sample has dissolved all it can, add more distilled water, this time up to the fill line of the flask. Again swirl the solution to completely dissolve whatever solute was left in the flask, about another 8 to 10 minutes. 5) After well dissolved, transfer about 50mL of the calcium hydroxide solution into the 100mL beaker using the 25mL volumetric pipet and bulb (thus, measure it out twice). 6)
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zalles_Exp5 - Experiment 5 Conductometric Titration Spring...

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