The Reaction of Sodium Thiosulphate with Hydrochloric Acid
Plan
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I am going to investigate the rates of reaction when sodium
thiosulphate reacts with hydrochloric acid. The rate of reaction is
the rate of loss of a reactant or the rate of formation of a product
during a chemical reaction. It is measured by dividing 1 by the time
taken for the reaction to take place:
1
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Seconds
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There are five factors, which affect the rate of a reaction, they are:
1. Temperature
2. Concentration
3. Pressure
4. Surface Area
5. Catalyst
Therefore the independent variable will be the temperature, the
dependant variable will be the time, and the control will be me.
I Have decided to investigate what effect temperature has on the rate
of reaction, because it is the most practical to do, and it doesn't
take a lot of time. Whenever I am carrying out my investigation I will
need to know about all the substances that I am using, so I will look
up books and the Internet to find out more about them.
Prediction
I think that when the experiments are repeated at a higher
temperature, the time it will take for the reaction to happen will get
quicker. The reason I think this is because heat makes particles move
faster, and the more heat there is the faster the particles move.
Therefore in the experiment, when more heat is added the particles
will be moving faster and colliding more often, making the time for
the reaction to happen less.
Method
5 cm of hydrochloric acid and 15 cm of sodium are poured out into two
measuring cylinders. A beaker is half filled with hot water from a
tap. The water is placed on top of a Bunsen on a blue flame and the
two measuring placed inside the water bath. The water is heated to the
necessary temperature, then the two measuring cylinders are taken out
Apparatus: * 1 measuring cylinder * 1 test tube * 1 stop clock * A large gelatine cube containing indicator and NaOH * Hydrochloric acid ranging from 1-3 molars * A scalpel Diagram: Method: * Take the large gelatine cube and cut into 15 equal pieces * Place on piece of the cube into the test tube * Measure out 10mls of HCl in the measuring cylinder * Pour the HCl into the test tube with the gelatine cube and start the clock * Time how long it takes for the pink colour inside the gelatine cube to completely disappear * You will also notice that the cube dissolves slightly * Record your results and repeat this same process 3 times for each molar of acid: § 1 molar § 1.5 molar § 2 molar
ranging from 50 cm³ of acid and no water, to 12.5 cm³ of acid and 37.5
4. Pour about 300mL of tap water into the beaker. Set up a hot-water bath using a hot plate, retort stand, and thermometer clamp. Alternatively, use a Bunsen burner, retort stand, ring clamp, thermometer clamp, and wire gauze.
Hydrochloric Acid, Sodium Thiosulphate Reaction. Research: What is the difference between Hydrochloric acid is a strong colourless acid formed when hydrogen chloride gas dissociates in water, used in industrial and laboratory. processes. The.
= = = == I predict that as the concentration of the hydrochloric acid decreases the rate of reaction will decrease and therefore the time taken for 75ml of gas to be released will increase.
The Effect of Temperature on the Rate of Reaction Between Sodium Thiosulphate and Hydrochloric Acid
and alcohol which I am using is on a brick under a tripod. On the
The Arrhenius equation ln k = ln A – (Ea / RT) can be shown
The Effect of Sodium Thiosulphate Solution on the Rate of its Reaction with Hydrochloric Acid
Normal water will not do because of the impurities in it. · Methyl Orange indicator - The colour of this indicates when the sodium hydroxide has been neutralised by the hydrochloric acid. · Conical Flask - This is used to react the aspirin tablets with the sodium hydroxide. It is more appropriate to use as the shape of it makes it less likely that any should spill out. · Burette - This is used to add the hydrochloric acid to the sodium hydroxide.
I will not add a catalyst to my solution and I will not stir my solution. · I will use 25cm3 of hydrochloric acid. · I will use 1g of calcium carbonate.
a bigger one so I can fit the cross under it and also be able to pour
from 10cm to 50cm to make it easier to see the difference in a graph.
Reactions occur when the particles of reactants collide together continuously. If they collide with sufficient energy, then they will react. The minimum amount of kinetic energy required for particles at the time of collision is called the activation energy and this theory is known as the ?collision theory?.
1. The labels have fallen off of three bottles thought to contain hydrochloric acid, or sodium chloride solution, or sodium hydroxide solution. Describe a simple experiment which would allow you to determine which bottle contains which solution.