Thursday, April 12, 2012

Rates of reaction between hydrochloric acid and sodium sulphate

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The rate of a chemical reaction is the amount of reactant used up, or product made, in a given time. Do not use the words speed or how fast. The rate of a reaction can be measured in one of two general ways.


Here the reaction is started and timed until it is finished. Each experiment produces one reading. No readings are taken during the reaction.


e.g. Reaction between sodium thiosulphate and dilute acid


NaSO(aq) + HCl(aq) -- S(s) + SO(g) + NaCl(aq) + HO(l)


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Here the reaction is started and timed until it is finished. Each experiment produces one reading. No readings are taken during the reaction.


e.g. Reaction between sodium thiosulphate and dilute acid


NaSO(aq) + HCl(aq) -- S(s) + SO(g) + NaCl(aq) + HO(l)


Here the reaction is started and timed until it is finished. Each experiment produces one reading. No readings are taken during the reaction.


e.g. Reaction between sodium thiosulphate and dilute acid


NaSO(aq) + HCl(aq) -- S(s) + SO(g) + NaCl(aq) + HO(l)





When certain a solid is added to a solution of hydrogen peroxide in water, it makes the hydrogen peroxide break down into water and oxygen gas much faster then it would on its own. This is a decomposition reaction. The solid is acting as a catalyst


HO(aq)





HO(l)


+


O(g)





hydrogen peroxide


solution


solid


catalyst


water





oxygen





You could prove that the gas given of was


oxygen, by collecting it in a tube. You then


light a wooden splint.





You then blow the flame out so that is


glowing red and then put it into the tube.





The splint should relight if the gas in the


tube is oxygen.





if it does not relight, it is not oxygen!


When you choose a run, the solid is added to the flask containing the hydrogen peroxide solution. After a short time, the reaction starts and you will see the reading on a gas syringe change as the oxygen gas is formed. The experiment has been speeded up so that you dont have to wait as long as you normally would!


You need to record the time that has passed and the volume of oxygen gas which has been formed, so you had better have a results table ready!





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