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Lecture 8

CHM1045 Lecture Notes - Khuddakapatha, Stopcock, Purified Water

by OneClass1947233 , Summer 2017
2 Pages
16 Views
Summer 2017

Department
Chemistry
Course Code
CHM1045
Professor
Russell Rines
Lecture
8

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Laura Quizena
3/22/17
Dr. Rines
CHM1045: LAB 8
Quantitive Analysis of Vinegar via Titration
PROCEDURE:
PART A: Standardizing a Dilute Sodium Hydroxide, NaOH (aq), Solution
1. Use your 600mL beaker to add ~475mL of deoinized water to a clean, large plastic bottle.
2. Use your 100mL graduated cylinder to measure 25mL of 6 M NaOH, + it to water in bottle.
Shake well to get uniform solution. Will use dilution for the rest of the experiment.
3. Rinse out buret several times with deoinized water. Dry the outside, and clamp to stand. Turn
stopcock perpendicular (closed), parallel (open).
4. Condition buret by rinsing with NaOh dilution using funnel. Place a large beaker under the
buret as a waste container, leave stopcock open and let it run out.
5. Close the stopcock, refill buret with NaOH solution close to 0.00mL. V exactly 0.00mL. Tip
of buret will not have any solution, quickly open and close to fill tip of buret. Record V1.
6. Obtain 3 clean 125mL Erlenmeyer flasks, label 1,2,3. Weigh out (3 decimals) 1.0-1.5g KHP
in tared weighing boat & quantitively transferring the sample to flask #1. Record exact mass.
Add ~25mL of deionized water to flask #1, and swirl to dissolve the solid KHP. If does not
dissolve, heat flask on hot plate until solid has dissolved.
7. Repeat 1.0-1.5 KHP and transfer for flask 2 & 3. Record mass (3 decimals). Add ~25mL of
water to each of these flasks, & swirl to help dissolve the KHP. Set aside, titrate flask #1:
8. Add 2-3 drops of phenolphtalein indicator to your KHP solution in the flask.
9. Obtain a stir plate and a stir bar. Set up stir plate under buret, and turn the dial to OFF. Place a
piece of white paper between the flask and the stir plate.
10. Holding the flask at an angle, lower stir bar into flask, so no KHP solution splashes out. Place
the flask on top of the stir plate, and adjust the dial on the stir plate until the bar stirs.
11. Position flask under buret, open stopcock so NaOH flows into the flask. When you begin
seeing flashes of pink, adjust stopcock, so NaOH drips slower. When turns pink, close.
12. Record Vfinal of NaOH (to 2 decimal places) on Lab Report.
13. Retrieve stir bar, wash and rinse, and slowly lower to flask 2. Refill buret close 0.00mL,
record Vinitial and repeat titration (step 8 →) for trial 2. Record Vfinal on Lab Report.
14. Retrieve stir bar, wash and rinse, and slowly lower to flask 3. Refill buret close 0.00mL,
record Vinitial and repeat titration (step 8 →) for trial 3. Record Vfinal on Lab Report.
15. Dispose of neutralized solutions in appropriate waste containers. Wash and rinse Erlenmeyer
flasks. You will still use your NaOH solution for Part B.
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Description
Laura Quizena 3/22/17 Dr. Rines CHM1045: LAB 8 Quantitive Analysis of Vinegar via Titration PROCEDURE: PART A: Standardizing a Dilute Sodium Hydroxide, NaOH (aq), Solution 1. Use your 600mL beaker to add ~475mL of deoinized water to a clean, large plastic bottle. 2. Use your 100mL graduated cylinder to measure 25mL of 6 M NaOH, + it to water in bottle. Shake well to get uniform solution. Will use dilution for the rest of the experiment. 3. Rinse out buret several times with deoinized water. Dry the outside, and clamp to stand. Turn stopcock perpendicular (closed), parallel (open). 4. Condition buret by rinsing with NaOh dilution using funnel. Place a large beaker under the buret as a waste container, leave stopcock open and let it run out. 5. Close the stopcock, refill buret with NaOH solution close to 0.00mL. V ≠ exactly 0.00mL. Tip of buret will not have any solution, quickly open and close to fill tip of buret. Record V 1 6. Obtain 3 clean 125mL Erlenmeyer flasks, label 1,2,3. Weigh out (3 decimals) 1.0-1.5g KHP in tared weighing boat & quantitively transferring the sample to flask #1. Record exact mass. Add ~25mL of deionized water to flask #1, and swirl to dissolve the solid KHP. If does not dissolve, heat flask on hot plate until solid has dissolved. 7. Repeat 1.0-1.5 KHP and transfer for flask 2 & 3. Record mass (3 decimals). Add ~25mL of water to each of these flasks, & swirl to help dissolve the KHP. Set aside, titrate flask #1: 8. Add 2-3 drops of phenolphtalein indicator to your KHP solution in the flask. 9. Obtain a stir plate and a stir bar. Set up stir plate under buret, and turn the dial to OFF. Place a piece of white paper between t
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