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Trial 1 Flask Reference Drops Net of Acid added Acid 15 drops drops of 25 (ref- expt) UMCO₂ represented (net drops x UMCO₂/drop) Time Interval Volume 30 mins of fish (hour) (ml) 3 ml Respiration rate (UMCO₂/ml hour)

Trial 1 Flask Reference Drops Net of Acid added Acid 15 drops drops of 25 (ref- expt) UMCO₂ represented (net drops x UMCO₂/drop) Time Interval Volume 30 mins of fish (hour) (ml) 3 ml Respiration rate (UMCO₂/ml hour)

Fundamentals Of Analytical Chemistry
Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter5: Errors In Chemical Analyses
Section: Chapter Questions
Problem 5.10QAP
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Trial Flask Drops Net UMCO2 Time Volume Respiration of drops rate represented Interval of fish of (UMCO2/ml Acid (net drops x (hour) (ml) hour) added Acid UMCO:/drop) (ref- exrt) 15 Reference drops 30 mins 3 ml 25 Experimental drops 15 Reference drops 45 mins 2 ml 30 Experimental drops 15 Reference drops 3 20 mins 4 ml Experimental drops * UMCO2 can be computed by multiplying ml/ drop x 10 UMCO2/ml = UMCO2/drop 2.
Transcribed Image Text:Trial Flask Drops Net UMCO2 Time Volume Respiration of drops rate represented Interval of fish of (UMCO2/ml Acid (net drops x (hour) (ml) hour) added Acid UMCO:/drop) (ref- exrt) 15 Reference drops 30 mins 3 ml 25 Experimental drops 15 Reference drops 45 mins 2 ml 30 Experimental drops 15 Reference drops 3 20 mins 4 ml Experimental drops * UMCO2 can be computed by multiplying ml/ drop x 10 UMCO2/ml = UMCO2/drop 2.
Procedure: 1. Calibrate an eyedropper by carefully counting the number of drops it takes to fill a 10 ml graduated cylinder to the 2.0 ml mark. Hold the dropper vertical and do not touch the sides of the cylinder. Repeat the measurement twice and take the average of the three values. Divide the 2 ml by the average number of drops to obtain the VOLUME (ml) PER DROP. Use this calibrated dropper for the titration later. 2. Put 80 ml of pink tap water-phenolphthalein solution (to be prepared by the instructor) in a 100 ml graduated cylinder and carefully add a small fish. Record volume of the fish and note the starting time. 3. Pour the contents into a clean plastic cup. Put 80 ml of the same solution into another flask to serve as the reference. 4. Observe the color of the solution in the experimental flask against a white background. If the solution becomes clear in less than 30 minutes, terminate the experiment and record the elapsed time. If it hasn't cleared by 30 minutes, terminate it then. Carefully remove the fish and return to its proper place. 5. If solution remains pink, add 0.01N sulfuric acid dropwise using your calibrated dropper to both reference and experimental flask until solution clears. Record number of drops in the table. 6. Make 3 trials. Use different fish in every trial.
Transcribed Image Text:Procedure: 1. Calibrate an eyedropper by carefully counting the number of drops it takes to fill a 10 ml graduated cylinder to the 2.0 ml mark. Hold the dropper vertical and do not touch the sides of the cylinder. Repeat the measurement twice and take the average of the three values. Divide the 2 ml by the average number of drops to obtain the VOLUME (ml) PER DROP. Use this calibrated dropper for the titration later. 2. Put 80 ml of pink tap water-phenolphthalein solution (to be prepared by the instructor) in a 100 ml graduated cylinder and carefully add a small fish. Record volume of the fish and note the starting time. 3. Pour the contents into a clean plastic cup. Put 80 ml of the same solution into another flask to serve as the reference. 4. Observe the color of the solution in the experimental flask against a white background. If the solution becomes clear in less than 30 minutes, terminate the experiment and record the elapsed time. If it hasn't cleared by 30 minutes, terminate it then. Carefully remove the fish and return to its proper place. 5. If solution remains pink, add 0.01N sulfuric acid dropwise using your calibrated dropper to both reference and experimental flask until solution clears. Record number of drops in the table. 6. Make 3 trials. Use different fish in every trial.
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