This website uses cookies to ensure you have the best experience. Learn more

Rates Of Reaction Essay

2549 words - 10 pages

Investigating the rate of reaction between sodium thiosulphate and hydrochloric acid

I am going to measure the rate of the reaction when hydrochloric acid
is added to sodium thiosulphate. I am going to investigate what effect
the concentration of the sodium thiosulphate has on the reaction rate.

When sodium thiosulphate and hydrochloric acid are mixed, a yellow
precipitate of sulphur is produced. The solution becomes increasingly
difficult to see through as more and more sulphur is formed. This is
how I plan to measure the rate of the reaction. I will place a
laminated cross underneath the solution and will stop the stop clock
when the cross can no longer be seen.

I aim to conduct a fair and safe investigation to determine what
affects the rate of the reaction.


Possible independent variables are temperature, amount of hydrochloric
acid, concentration of Hydrochloric acid, amount or concentration of
sodium thiosulphate and whether or not a catalyst is added.

* My independent variable is going to be the concentration of sodium

* My dependant variable will be the rate of the reaction, or time
taken for the reaction to take place. Watching the cross disappear as
precipitation occurs and sulphur is formed as a solid will be the
method used to realise the rate.

* My controlled variables will be the temperature, the concentration
of hydrochloric acid, the amount of sodium thiosulphate and the amount
of hydrochloric acid. I will try and control these as far as possible,
and be as accurate as I can when measuring out the chemicals.

I will not be using a catalyst.


I predict that the higher the concentration of sodium thiosulphate,
the quicker it will react with the hydrochloric acid. This prediction
is explained by the theory below: -

When two chemicals react, their molecules have to collide with each
other with sufficient energy for the reaction to take place. This is
collision theory. The two molecules will only react if they have
enough energy. This is known as activation energy. Increasing the
concentration of the reactants will increase the frequency of
collisions between the two reactants. The following diagram
illustrates this theory with the reaction between magnesium and
hydrochloric acid, whereas we are using sodium thiosulphate instead of
magnesium, but the theory is clearer if we use a solid as one of the

However, when collisions occur, they do not always result in a
reaction. Only if the two colliding molecules have sufficient energy
will they react. This is the kinetic theory. It is normally applied to
temperature, i.e., increasing temperature means the molecules move
faster, but it is also relevant here.

So, we can deduce from this that the temperature will also affect the
experiment and therefore must remain constant.

It is also relevant to note the following: -

For a chemical reaction to take place, some bonds in the reactants
must be...

Find Another Essay On Rates of Reaction

Investigating Reaction Rates of Sodium Thiosulphate and Hydrochloric Acid

2235 words - 9 pages 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

Rates of Reaction - Sodium Thiosulphate and Hydrochloric acid

1973 words - 8 pages Rates of Reaction - Sodium Thiosulphate and Hydrochloric acid In this piece of coursework, I will study how concentration affects the rate of reaction. I will do so by timing the reaction of Sodium Thiosulphate with an acid. In this coursework, I will include background knowledge, prediction, safety, results, calculations, graphs, an analysis, conclusion and an evaluation. In my evaluation I will comment on how reliable my results were and how

Investigating how surface area affects rates of reaction

782 words - 3 pages Investigating how surface area affects rates of reaction.Background Info:Enzymes are biological catalysts. They break down the chemical they are uniquely made for, such as proteins, fats and some harmful substances like Hydrogen Peroxide.An enzyme basically works on a key and lock like system. The enzyme is unique to its self but many others may be close to the exact shape, but not quite. Therefore allowing substrates to fit into its activesite

Rates of reaction

2843 words - 11 pages An excellent project, very perceptive -BACKGROUND INFORMATIONWhat affects the rate of reaction?1) The surface area of the magnesium.2) The temperature of the reaction.3) Concentration of the hydrochloric acid.4) Presence of a catalyst.In the experiment we use hydrochloric acid which reacts with themagnesium to form magnesium chloride. The hydrogen ions givehydrochloric acid its acidic properties, so that all solutions ofhydrogen chloride and

Formal Lab Report Rates Of Reaction Alkali Metals And Alkaline Earth Metals

1825 words - 8 pages AbstractThe rates of reaction of Alkali metals and Alkaline Earth meatals are compared in this lab. The pH of each of the resulting metal solutions are tested and the products of the reaction between calcium and water is discovered. The tested elements are sodium, lithium, potassium and calcium and each of them were placed in a beaker filled with water. The resulting solutions pH levels were tested with litmus paper. There were more steps for

Rates Of reaction- The reaction between limestone and hydrochloric acid

873 words - 3 pages think this as all the particles of limestone will be roughly the same size, the particles have a larger surface area than cubed limestone, therefore it will react the quickest. If you were to use cubed limestone it wouldn't be fair as no cube will be exactly the same size. In conclusion to this experiment, 0.5M of acid was the best to use as it had the best measurable reaction time.EquipmentThe equipment we will be using during this experiment is

Marble chip investigation - rates of reaction, studying the effects of change in concentration of the acid

1745 words - 7 pages 稡oss head clamp稵ub稴topwatchSafetyHydrochloric acid is very corrosive, so care will be taken when handling it. Safety goggles will be worn throughout the investigation as the reaction could fizz violently and cause eye damage if it was to spit.Variables稵emperature稢oncentration of acid稴urface area of marble chips稭ass of marble chips稸olume of acidKey VariableThe only variable that I will

An investigation to compare the reaction rates between potato an hydrogen peroxide and liver and hydrogen peroxide

1981 words - 8 pages An investigation to compare the reaction rates between potato and hydrogen peroxide against liver and hydrogen peroxide through loss in mass.Background information:Catalase is an enzyme that is found in all cells. This means that it is an intracellular enzyme. And enzyme is a biological catalyst. A catalyst is some thing that speeds up a reaction without being changed itself. Because of this enzymes and catalysts can be used again and again

Rates if Reaction GCSE Cousrework

3160 words - 13 pages the reactants.6. The surface area of the surface of the marble.My VariableI have chosen to study how the concentration of one of the reactants affects the rate of the reaction. I have chosen this because along with altering the amount of reactants it is the only practical of accurately changing the conditions. To keep a temperature constant at any temperature would require an incubator or the like. There is no easy way to shake different test

Order of Reaction / Rate Law

684 words - 3 pages The order of a reaction is the power to which the concentration of a reactant must be raised to give the experimentally observed relationship between concentration and rate The rate of a reaction depends in part on the concentrations of the reactants. For a reaction in which reactant A forms product B in one step, you can write a simple equation. A→B The rate at which A forms B can be expressed as the change in A (∆A) with time

Rate of Reaction Coursework

532 words - 2 pages Rates of Reaction A chemical reaction can only occur between particles when they collide (hit each other). Particles may be atoms, ions or molecules. There is a minimum amount of energy which colliding particles need in order to react with each other. If the colliding particles have less than this minimum energy then they just bounce off each other and no reaction occurs. This minimum energy is called the activation energy. The

Similar Essays

Rates Of Reaction Essay

3996 words - 16 pages Investigation Rates of Reaction InvestigationAim: To investigate the effect of concentration on the rate of reaction between hydrochloric acid, water and magnesium. I am investigating the following reaction: Mg + 2HCl MgCl2 + H2 Magnesium + Hydrochloric Acid Magnesium Chloride + Water During this investigation we will be trying to find out how much affect different concentrations of hydrochloric acid has on the production of hydrogen (product

Rates Of Reaction Investigation Essay

1543 words - 6 pages particles there are per volume of acid. Therefore, more collisions per second will occur and then there will be more successful collisions per second.Temperature of the acid - Rates of reaction increase with a higher temperature because the particles involved in the reaction have more energy to move (from the heat) so they collide more rapidly. This will give more successful collisions per second, and therefore it is essential to keep the

Rates Of Reaction Of The Halogenoalkanes

1616 words - 6 pages Rates of reaction of the halogenoalkanes scientific knowledge and understanding: Halogenoalkanes are classified as either primary, secondary or tertiary. In primary halogenoalkanes the halogen atom is covalently bonded to a carbon atom which is bonded to one other carbon, to two other carbons in secondary and three others in tertiary. Apparatus for a reflux Increasing the size of the halogen atom in the halogenoalkane decreases

Chemistry Report: Experiment On Rates Of Reaction

3605 words - 14 pages Rates of Reaction CaCO3 + 2HCl → CaCl2 + H2O + CO2 In this report I will be suggesting my predictions on what the rates of reaction will be and what the actual rates of reaction are. I will do this by collecting data from experiments and I will show this by putting data into a table. The main aim of my experiment is to find the rate of reaction over time taken and the rate of reaction when the concentration of hydrochloric acid increases or