Rate of Reaction of Dilute Hydrochloric Acid and Sodium Thiosulphate
To investigate the change in rate of reaction between DILUTE HYDROCHLORIC
ACID and SODIUM THIOSULPHATE as the concentration varies.
PLAN
A chemical reaction takes place over a specific period of time i.e.
which is the time for the reactants to be formed into the products. If
the reactants take a relatively short time to form the products, the
reaction is known as a FAST one. The RATE of that particular reaction
is high. On the other hand, a reaction which takes a longer time is
known as a SLOW reaction, and as a result is known to have a LOW rate
of reaction.
There are several factors which alter can alter the speed/rate of a
reaction. These are:
-Temperature
-Addition of a Catalyst
-Size of Particles of a Solid Reactant
-Presence of Light
-Pressure
-Concentration of Reactants in Solution
I shall now look at HOW each of the above factors influences the speed
at which a reaction occurs.
TEMPERATURE- At a higher temperature, the ions within the solution
possesses greater levels of kinetic energy (movement), and
consequently, whilst they move through the solution more rapidly, they
collide a greater number of times amongst each other and also with a
greater force as well i.e. more vigorously. Therefore there is a
greater chance of success that a reaction will take place between the
two particles, and as the chances of success are increased even
further, more reactions take place, which increases the rate of
reaction as a whole.
Constant: The temperature shall be kept constant by carrying out the
experiment in the same room with windows open during both sessions
during the course of two days.
CATALYST- A catalyst is a substance which increases the speed of a
chemical reaction without being used up. Certain catalysts increase
the rate of reactions, whereas others are used to decrease the
required reaction temperature which saves energy. So, in other words,
they reduce activation energy levels. A catalyst works by increasing
the chances of particles colliding by providing a ‘sticky’ surface on
which particles stick onto and have a collision. Therefore the greater
the size of the catalyst, the higher the rate of reaction.
Constant: A catalyst won’t be used in our experiment.
PARTICLE SIZE- Obviously, as the surface area of a react...
... middle of paper ...
... which helped to minimize errors. The experiment was relatively
suitable for the task to be carried out, and it was very effective and
accurate in producing results. It could have been improved by
experimenting on a greater variety of concentrations and by measuring
the liquids more accurately and consistently.
From the evidence, there seems to be a great deal of consistency in
the averages, and almost a constant difference between these averages
throughout. Each of the readings for a particular concentration level
are very close together, suggesting that this accuracy meant that the
evidence is more than reliable enough to support the prediction. A
wide range of values was used, with repeated readings, making the data
more reliable, therefore making it more than sufficient enough to
support the prediction.
To expand on the experiment, we could investigate on other factors
which can alter the rate of reaction, such as pressure, temperature or
particle size, and as a result, we could see whether they have a
bigger impact on the rate than concentration does. This way, we would
be able to see how much of an effect concentration has in relation to
other factors.
How am I going to make it a fair test I will use a clean flask for
Investigating Reaction Rates of Sodium Thiosulphate and Hydrochloric Acid Aim: To investigate the rate of reaction of Sodium Thiosulphate and Hydrochloric acid. In this investigation I will be varying the concentration of Sodium Thiosulphate only and not the Hydrochloric acid concentration. In this investigation I will use the following word equation: Sodium Thiosulphate + Hydrochloric acid In this investigation I will use the following symbol equation: Na2S2O3 + Hcl Prediction: I predict that as the Sodium Thiosulphate concentration increases the rate of reaction will also increase. The reason I predict this is because there will be a higher concentration of particles and so a faster reaction would be able to occur-
· Rinse out mixture in flask and leave water running to get rid of the
It is primarily excreted unchanged in the urine and has half life of 10 to 31 hours.
... physical education (J. Sproule, Ed.). Retrieved February 25, 2014, from Sage Journal website: http://epe.sagepub.com/content/11/3/257.short#cited-by
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Rate of Reaction Between Calcium Carbonate and Hydrochloric Acid Plan: In my experiment I will measure the rate of reaction between calcium carbonate and hydrochloric acid. The rate of the reaction is the speed that the reaction takes place so by measuring the rate I will measure the amount of time the reaction takes. Hydrochloric acid is a strong acid that is found in digestive juices in the stomach, it is also used for cleaning metals before they are coated. Calcium carbonate has a few forms including chalk and limestone the main use of these two materials is in the making of concrete, which is used for many things such as buildings. When you put calcium carbonate and hydrochloric acid together they react to form calcium chloride, carbon dioxide and water.
from 10cm to 50cm to make it easier to see the difference in a graph.
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My aim in this piece of work is to see the effect of temperature on the rate of a reaction in a solution of hydrochloric acid containing sodium thiosulphate.