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Investigating the Effect of Concentration Changes On Rate of Reaction

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Investigating the effect of concentration changes on rate of Reaction Outline When Hydrochloric acid reacts with Sodium thiosulphate, a fine suspension of sulphur slowly forms. 2HCl + Na S O 2NaCl + S + SO + H O When the concentration of hydrochloric acid changes the rate also changes. To measure the effect of concentration on rate , we need to carry out an experiment, in which the rate would be measured by finding out how quickly the sulphur forms. These factors affect rate in this experiment: 1. Concentration 2. Pressure 3. Temperature 4. Catalysts (Surface area would have no effect as it only has an effect on solids.) The concentration is what we are going to change, therefore it is the independent variable. ...read more.


The rate of a reaction can be changed by altered by changing the number of collisions per unit time or increasing the percentage of collisions that are successful, i.e. Have E>Ea. Therefore, when the concentration of HCl decreases, the particles per unit volume decreases, the number of collisions per unit time decreases, and so the rate is also likely to decrease. Also, to ensure the experiment takes place fairly, the following must remain the same in each experiment: 1. Temperature 2. Pressure 3. Catalysts used 4. Surface area 5. Volume of sodium thiosulpate 6. Volume of HCl solution 7. Concentration of Sodium thiosulphate Temperature and pressure can be kept constant by using the same place for the reaction to occur for each molarity of HCl. ...read more.


Apparatus 150cm� conical flask; 10cm� and 50cm� measuring cylinders; 10cm� test-tube; stop clock; test tube rack; square of white paper (5cm x 5cm) Chemicals: Sodium Thiosulphate; 2M Hydrochloric acid Cross on paper viewed through solution Dilute HCl And sodium thisulphate View through solution: Method 1. Pour 50cm� of Sodium thiosulphate into a conical flask. 2. Measure 5cm� of 2M Hydrochloric acid using small cylinder and pour into a test-tube. 3. Draw a small cross on the paper and place it under the flask. 4. Pour the acid into the flask and start the clock. 5. Note down the time it takes for the cross to disappear. 6. Wash out the flask thoroughly and repeat the above method using the following volumes of 2M HCl mixed with water: Volume of 2M Hcl (cm�) Volume of water (cm�) Molarity (M) 5 0 2 4 1 1.6 3 2 1.2 2 3 0.8 1 4 0.4 ...read more.

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