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

An experiment to find the rate of reaction between two liquids

Extracts from this document...


An experiment to find the rate of reaction between two liquids Introduction This is an experiment to determine the effect of changing the concentration of sodium thiosluphate (Na S O (aq)) on the rate of reaction between sodium thiosulphate and hydrochloric acid (HCL (aq)). HCl+sodium thiosulphatesodium chloride+sulphur dioxide+sulphur+water. HCl(aq) + Na2S2O3(aq) NaCl(aq) + SO2(g) + S(s) + H2O(l) If one were to place hydrochloric acid and sodium thiosulphate into a beaker a white cloudy solution is left in the beaker. The rate of the reaction can be controlled by concentrating one of the liquids, or one could add water to dilute the mixture to slow the reaction. Method Apparatus Two beakers of 50cm3 Sodium Thiosulphate Hydrochloric acid Conical flask Measuring tube-10cm3 Measuring tube-50cm3 The apparatus is set up as shown above. I will place 50cm3 of Sodium Thiosulphate; I will keep Hydrochloric acid at a constant rate of 5cm3. Then I will reduce the sodium thiosulphate and increase the water, for example: 50cm3: 0cm3 40cm3: 10cm3 30cm3: 20cm3 20cm3: 30cm3 10cm3: 40cm3 When the reaction is complete the solution left should be white and cloudy, to test this; I will place a piece of paper with a cross on it. ...read more.


If one was to have low sodium thiosulphate and a high level of water than the reaction will be slow. The reaction is explained by the graph below: 1: At this point in the graph the reaction is very quick due to a high gradient. There is a high concentration of Sodium Thiosulphate, so there are more successful collisions of particles hitting the atoms. 2: The concentration of sodium thiosulphate is low so there are fewer particles meaning less successful collisions leading to a slow reaction. 3: The graph has now started to level off because there is nearly no sodium thiosulphate in the solution, therefore there are less particles meaning much less successful collisions, and the particles which are colliding and have non- successful collisions loose a substantial amount of energy. If there are much less unsuccessful collisions then the reaction will be a very slow reaction. Preliminary results Hydrochloric acid. Sodium Thiosulphate. Distilled water. Time 5 40 10 22.3secs 5 30 20 40.5secs 5 20 30 1.46secs 5 10 40 2.20secs From my preliminary results I can see that my prediction was correct. But there are a number of ways to improve my experiment: 1. Take more than one reading 2. ...read more.


Firstly, my results give conclusive evidence that as the amount of Thiosulphate decreases, and the amount of water increases in the solution, there are less reactive atoms to collide and therefore less successful collisions causing little chemical change so the reaction rate is slower. In a more concentrated solution, there are more atoms to collide so the reaction time is quicker. My results support the prediction I made because I said 'the greater the concentration of thiosulphate solution, the faster the chemical reaction will take place.' I believe I was correct and a secondary sources from the Internet state that the reaction time will be faster with a more concentrated solution because, 'the more molecules there are, the frequency of successful collisions is greater and therefore the reaction rate is speeded up.' I could have also done an experiment like this one: The experiment would consist of Magnesium ribbon and Hydrochloric acid. I would have 0.06g of magnesium ribbon in one conical flask which is connected to a glass syringe and then a conical flask containing 0.06g of magnesium, but in the first conical flask it would contain 50cm3 of 1M hydrochloric acid and the second flask would contain 50cm3 of 05 M hydrochloric acid. Using the glass syringe I can measure the rate of reaction between these two different concentrations. The apparatus would be set up as shown below. ?? ?? ?? ?? 4 ...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