The Effect of Concentrtion on Reaction Rate

The Effect of Concentrtion on Reaction Rate - Continued The...

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Continued The Effect of Concentration on Reaction Rate Prashanth Rasanayagam Monday, February 09, 2009 SCH 4UC Ms.Varnes Investigation 9.1 - The Effect of Concentration on Reaction Rate
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Introduction For many reactions involving liquids and gases a shift in concentration would change the reaction rate. As reactant concentration increases, the frequency of collision increases. If there is more of a substance in a system, there is a greater chance that molecules will collide and speed up the rate of the reaction. If there is less of a substance, there will be fewer collisions and the reaction will happen at a slower speed. In this investigation, hydrochloric acid will be added to different concentrations of sodium thiosulfate and the time it takes for the solution to turn completely opaque and cover the x written on a paper below the beaker would be recorded. Depending on the concentration of sodium thiosulfate, the reaction time would differ thus demonstrating the relationship between concentration and reaction rate. Materials Hydrochloric Acid, [HCl (aq) ], 2M Sodium Thiosulfate, [Na 2 S 2 O 3(aq)] ) , 0.15M One large (100cm 3 ) measuring cylinder One small (10 cm 3 ) measuring cylinder Two 100 cm 3 beakers Two 250 cm 3 beakers Stop watch Glass stirring rod 3 test pipettes Paper Marker Distilled Water [H 2 O (l) ] Data Collection Table 1: Initial Qualitative Observations for Reactants Reactants Observations Hydrochloric acid [HCl (aq.) ] Colourless solution Transparent Smell - vinegar
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Sodium thiosulfate [Na 2 S 2 O 3(aq.) ] Colourless Transparent Distilled Water [H 2 O (l) ] Colourless Transparent Table 2: Results of Observations of Reaction Rate Volume of 2M HCl (aq.) (cm 3 ) Volume of 0.15M Na 2 S 2 O 3(aq.) (cm 3 ) Volume of distilled water (cm 3 ) Concentration of Na 2 S 2 O 3(aq.) solution (mol.dm 3 ) Time for X to disappear (seconds ± 0.05) Reaction Rate (= 1/Time) (s -1 ± 0.05) 5 50 0 0.15 25 0.040 5 40 10 0.12 27 0.037 5 30 20 0.09 41 0.024 5 20 30 0.06 68 0.015 5 10 40 0.03 169 0.0060 The stopwatch was stopped after the reaction went to completion. This was determined when the solution turned a white cloudy colour and the “X” on the paper under the solution was no longer visible. Reaction:
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This note was uploaded on 11/23/2009 for the course HIS HIS1d03 taught by Professor Dr.adams during the Fall '08 term at McMaster University.

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The Effect of Concentrtion on Reaction Rate - Continued The...

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