The Reaction Between Hydrochloric Acid and Sodium Thiosulphate
Introduction
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I am investigating how different concentrations of thiosulphate and
distilled water in ratio to 10cm³ of hydrochloric acid affect the rate
of reaction. I will also investigate if there will be a change in
temperature after the reaction has occurred. I will know when the
reaction is taking place as the solution turns from clear to opaque.
The reaction that takes place is as follows: -
Sodium + Hydrochloric à Sulphur + Sulphur + Sodium + Water
Thiosulphate acid dioxide chloride
Na S O + 2HCl à S + SO + 2NaCl + H O
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The reaction will have finished when the solution has turned
completely opaque and it is visible that the solution is not turning
increasingly more so. At atomic level, at this point all of the
particles in the solution will have stopped colliding.
My prediction
I predict that as the concentration of distilled water to sodium
thiosulphate increases, the rate of reaction will take longer as the
distilled water is making the solution weaker. This is due to the fact
that there will be less fruitful collisions between sodium
thiosulphate and the hydrochloric acid. This can be easier described
by using the following diagrams: -
Here there are many successful collisions between the sodium
thiosulphate and the hydrochloric acid because there is a large volume
of sodium thiosulphate in ration the volume of water, meaning that the
water cannot dilute the solution to a great enough extent.
Here there is no where near as many successful collisions as seen
previously. This is because there is a larger volume of water in
ration to the volume of sodium thiosulphate, meaning that there will
not be as many sodium thiosulphate molecules that would be able to
collide successfully.
Due to this collision theory, the higher the concentration of sodium
thiosulphate, the quicker the rate of reaction because there will be
more successful collisions happening in a shorter space of time.
Paragraph 2: It is believed that as the temperature of the water increases the time it will take for the tablet to dissolve will decrease. This is believed since the temperature there will be more energy allowing the particles to get together and form a reaction allowing the ta...
This is because there are more water molecules in a given volume to react with the Alka-Seltzer tablets. However if there are sufficient water molecules to occupy the Alka-Seltzer tablets an increase in the water molecules will not alter the rate of the reaction. This is because the Alka-Seltzer tablets are already working as fast as they can to react with the water. The concentration can be increased by increasing the volume of the water used in the reaction to dissolve the Alka-Seltzer tablets in. To control the... ...
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from 10cm to 50cm to make it easier to see the difference in a graph.
* Concentration - I will try my best to use all the acid from the
other more frequently. Therefore, the molecules react. Concentration increases the number of collisions. If the solution is made more concentrated it means there are more particles of reactant. knocking about between the water molecules, which causes collisions.
more of the reactants to react or the time it takes to produce a new
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