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how concentration affects reaction rate
effect of concentration on rate sodium thiosulphate higher chemisrty
how concentration affects reaction rate
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The Effect of Concentration on Reaction Rate
Introduction
I will be carrying out an investigation into how concentration affects
reaction rate. I will be looking at sodium thiosulphate and
hydrochloric acid. The reaction is represented by the following
equation:
[IMAGE]Na2S2O3(aq) + 2HCl(aq) 2NaCl(aq) + H2O(l) + SO2 (g) + S (s)
I will add the hydrochloric acid to the Sodium Thiosulphate and time
how log it takes for the mixture to turn opaque. I will use a
different concentration of Sodium Thiosulphate each time.
Prediction
My predictions, using previous knowledge is that the higher the
concentration of Sodium Thiosulphate there is the faster the reaction
rate will be.
This is based on the collision theory which I have outlined in
Background Knowledge.
In my preliminary work this has always been the case, for example if I
used 40 ml of Sodium Thiosulphate and 10 ml of water it was much
faster than when I used 10 ml of Sodium Thiosulphate and 40 ml of
water.
Background Knowledge
The rate of a reaction depends on two factors.
1) The number of collision per unit time between the reacting species.
2) The fraction of these collisions that are successful in producing a
mew molecule.
If two or more molecules collide but are not orientated correctly then
no reaction will take place. For a reaction to occur, molecules must
collide not only with sufficient energy but with the proper
orientation.
[IMAGE]
This diagram is the reaction between ethane, CH2CH2, and hydrogen
chloride, HCl.
In dilute Sodium Thiosulphate there are not so many particles. This
means that the chance of the particles colliding, and colliding
correctly is much less than if the Sodium Thiosulphate was
concentrated.
Apparatus
· Conical flask
· Burettes
· Measuring cylinder
· Funnels
· Thermometer
· Beakers
· Filter paper
· Sodium Thiosulphate
· Hydrochloric acid
CL-, as the ions of H+ and OH- react to form H2O. These spectator ions
In a substance the rate of reaction will be quicker if it has a large
It is important however to note that the NH4 and K ions are still in
The Effect of Changing the Concentration of the Enzyme Catalyst on the Rate of Reaction on Hydrogen Peroxide
In this experiment there five different phases and in each a different factor of the Collision Theory was tested. The first phase was called, Nature of the Reactants and it had three parts to it. In the first part of it which was steps 1-4, 5 pieces of mossy zinc were put into 3ml of 2M H_2 〖SO〗_4 and during this time bubbles were produced. After a few minutes the zinc was removed from the acid and it was now clean zinc.
Investigation: How does the concentration of acid affect the rate of reaction? The aim of this investigation is to test how concentration affects the rate of reaction. My prediction for my investigation is that the higher the concentration, the faster the reaction will be.
We will set up a conical flask on top a cross. We will vary the
How does concentration affect the rate of reaction between magnesium and sodium? and hydrochloric acid. Secondary resources:.. Chemical reactions only occur when reacting particles collide with each other, with sufficient energy to react, this is called the collision theory. The minimum amount of energy required to cause this.
Investigating the Effects of Dilution on the Rate of Reaction Between Sodium Thiosulphate and Dilute Hydrochloric Acid
The Effect of Concentration of Acid on the Rate of Reaction With Calcium Carbonate Calcium + Hydrochloric ð Calcium + Carbon + Water Carbonate Acid Chloride Dioxide CaCO3 (s) + 2HCl (aq) ð CaCl2 (aq) + CO2 (g) + H2O (l) Introduction I will be using the reaction between calcium carbonate and hydrochloric acid to see how the concentration of acid affects the rate of a reaction. By doing the above experiment I will prove that the higher the concentration of acid, the faster a reaction will occur. I have carried out a previous experiment called the 'Disappearing Cross', in which I used the reaction between thiosulphate, hydrochloric acid and water to see how concentration affects the rate of reaction. When we added the hydrochloric acid to the water and thiosulphate a reaction occurred, causing the water to become foggy so that the cross was no longer visible through the conical flask. The results for the Disappearing Cross experiment were as follows; Volume of Thiosulphate (Cm3) Volume of Water (Cm3) Volume of HCl (Cm3) Concentration (%) Time taken for X to disappear (seconds) 5 25 5 17 711 10 20 5 33 286 15 15 5 50 185 20 10 5 67 113 25 5 5 83 82 You can see that when the hydrochloric acid was most dilute the cross took 711 seconds to disappear, and when the acid was most concentrated the cross took just 82 seconds to disappear.
Investigating the Factors Influencing the Rate of Reaction Between Sodium Thiosulphate and Dilute Hydrochloric Acid
« Surface Area - If the reactant has a large surface area, there is a
The Effects of Concentration on Reaction Rate with Sodium Thiosulphate ---------------------------------------------------------------------- Planning = == == =
The Relationship Between Reaction Rate and Concentration I am going to investigate how varying the concentration of sodium thiosulphate solution affects the rate of reaction with hydrochloric. Acid. The equation for the reaction is: [IMAGE]Sodium thiosulphate + Hydrochloric Acid Sodium Chloride + Water + Sulphur + Sulphur dioxide [IMAGE]Na2S2O3(aq) + 2HCl(aq) 2NaCl(aq) + H2O(l) + S(s) + SO2(aq). This reaction has a definite end when the cross on the test tube. disappears (and disappears)).
The rate of reaction is how quickly or slowly reactants in chemical reactants turn into products. A low reaction rate is when the reaction takes a long time to take place; hence, a reaction that occurs quickly has a high reaction rate. A rate refers to how slow or quick the product is produced. It is possible to control the rate of chemical reactions and speed up or slow down the rate of chemical reactions by altering three main factors which are temperature, concentration and the surface area. When the temperature of the reactants increases, the molecules vibrate at a more intense speed therefore colliding with each other more frequently and with increased energy resulting in a greater rate of reaction. Accordingly, as the temperature decreases the molecules will move slower, colliding less frequently and with decreased energy resulting in the rate of reaction decreasing. Concentration is how much solute is dissolved into a solution and is also a factor that affects the rate of reaction. When the concentration is greater this means there is an increased amount of reactant atoms and molecules resulting in a higher chance that collisions between molecules will occur. A higher collision rate means a higher reaction rate. Consequently at lower concentrations there are reduced chances of the molecules colliding resulting in a lower reaction rate. The measurement of how much an area of a solid is exposed is called the surface area. The quicker a reaction will occur the more finely divided the solid is. For example, a powdered solid will usually have a greater rate of reaction in comparison to a solid lump that contains the same mass for it has a lower surface area than the powdered solid.