• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Reaction between thiosulphate and hydrochloric acid.

Extracts from this document...


I am going to investigate the reaction between thiosulphate and hydrochloric acid. Background information. Sodium Thiosulphate is made up of Sodium, Sulphur and Oxygen (NaSO). Hydrochloric acid is made up of Hydrogen and Chlorine (HCl). Both liquids are clear. The equation for this is: Planning. There four factors that can affect the rates of reaction these are: * Temperature, * Concentration, * Surface area, * The use of a catalyst. At low temperatures, particles of reacting substances do not have much energy. When the substances are heated, the particles take in energy. This causes them to move faster, and therefore they collide more often with a greater chance of a successful collision. This causes the rate of reaction to increase. Low temperature High temperature A reaction can be made to go faster or slower by changing the concentration of a reactant. If a reactant has a great concentration then there are more particle's involved in the reaction therefore there is more chance of a successful reaction and the rate is increased. Acid particle More particles more chance of a successful collision Powdered reactants react more vigorously than block reactants. ...read more.


As the reaction proceeds the solution turns cloudy and eventually yellow, when I can't see the 'X' through the solution, I will take this as the end of the reaction. Preliminary work. I have carried out preliminary work, to find out what concentration of Sodium Thiosulphate I am going to use. First I tried dissolving 5g of Thiosulphate in 10cm. I decided that I would try this out on the highest amount of Sodium Thiosulphate, which has not been added to water and I would try it out on the lowest amount of Sodium Thiosulphate, where the ratio of water is greater than the ratio of the Sodium Thiosulphate. Sodium Thiosulphate Water Time 5g/cm 10cm 71 secs I am not going to use this amount of Sodium Thiosulphate because it would take too long, so I am going to try 20g/cm of Sodium Thiosulphate, in 30cm of water. Sodium Thiosulphate Water Time 20g/cm 30cm 41 secs Sodium Thiosulphate concentration. Na S O : 5H O Ar (Na) = 23, Ar (S) = 32, Ar (O) = 16, Ar (H) ...read more.


The piece of paper with 'X' marked on it will then be placed underneath the conical flask. Then I will pour the two solutions into the conical flask and start the stopwatch. When I can not see the 'X' through the solution anymore I will stop the stopwatch, and take this as the end of the reaction. The 'X' disappears as the Sulphur is being produced. I will carry out the next four experiments, I will dilute the solution 10cm 3 of water, then 20cm3 of water, 30cm3 of water and finally 40cm3 of water and timed how long the reactions will take. Results. I have placed my results in the table below. Volume of Thiosulphate (cm3) Volume of Water (cm3) Concentration (mol/dm3) Time taken (secs) 1 2 Average (secs) 1/t (sec/-1) 50 0.16 23 23 23 0.043 40 10 0.128 32 29 31 0.032 30 20 0.096 35 36 35.5 0.028 20 30 0.064 59 61 60 0.017 10 40 0.032 172 179 175.5 0.00569 I have carried out each experiment twice in case of any error. I then worked out the average times for the reactions. Then I drew graphs of my results, on the next page. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work