Editing Common Ion Effect Lab
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<b>Pre-Lab calculations.</b><br> <br> 1) Determine the pH of a 0.10M HC<sub>2</sub>H<sub>3</sub>O<sub>2</sub> <nowiki>(HAc)</nowiki> solution.<br> <br> 2) Determine the pH of a 0.10M NH<sub>3</sub> solution.<br> <br> 3) Determine the pH of a 0.10M HC<sub>2</sub>H<sub>3</sub>O<sub>2</sub> <nowiki>(HAc)</nowiki> and 0.050M sodium acetate solution. (Same as 1 except adding in moles of Na<sub>1</sub>C<sub>2</sub>H<sub>3</sub>O<sub>2</sub> or a common ion effect problem).<br> <br> 4)Determine the pH of a 0.10M NH<sub>3</sub> and 0.050M ammonium chloride solution. (Again another common ion effect problem).<br> <br> 5) Determine how many grams of sodium acetate you need to weigh out to get 100.ml of a 0.050M sodium acetate solution. (Hint: don't worry about the HAc solution, just assume you are only making the sodium acetate solution by itself).<br> <br> 6) Determine how many grams of ammonium chloride you need to weigh out to get 100.ml of a 0.050M ammonium chloride solution. (Again assume you are only making the ammonium chloride solution by itself).<br> <br> <b>Lab Diections</b><br> <br> 1) Get a computer and Lab Pro equipment including a pH probe. Connect correctly and open up a lab that allows you to read pH values.<br> <br> 2) Obtain approximately 30ml of the 0.10M HAc solution. Determine the pH of this solution and record in data table. Wash off the pH probe with DI water.<br> <br> 3) In a 150.ml or 250.ml beaker, pour 100.ml of the 0.10M HAc solution (measured via graduated cylinder) into the beaker.<br> <br> 4) Weigh out the desired mass of sodium acetate you calculated in the Pre-lab calculations. Place into the HAc solution in the 150.ml or 250.ml beaker. Stir to dissolve.<br> <br> 5) Once dissolved, determine the pH of the solution and record in the data table. Wash off the pH probe with DI water.<br> <br> <br> Steps 6-9: Repeat Steps 2-5 for 0.10M NH<sub>3</sub> and 0.050M ammonium chloride solutions.<br> <br>
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