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

Investigation to find out the lengths of times for a solution of hydrochloric acid and different amounts of sodium thiosulphate and water to turn from clear to cloudy when there is either more water and less sodium thiosulphate or the other way round.

Extracts from this document...

Introduction

Introduction This is an investigation to find out the lengths of times for a solution of hydrochloric acid and different amounts of sodium thiosulphate and water to turn from clear to cloudy when there is either more water and less sodium thiosulphate or the other way round. To find this out, I am going to do an experiment and record my results to see what I learn from this. Before I do this experiment, I have some background knowledge that will help me to do this experiment properly. I know that a catalyst (in this case, the sodium thiosulphate) is a substance that when added to a reaction mixture, speeds up the reaction, but at the end remains chemically unchanged. It does this by providing an alternate reactions pathway with a lower activation energy. With this background knowledge, I can therefore make a prediction before I start doing my work on the experiment. I predict that when there is a larger volume of sodium thiosulphate to a smaller volume of water the reaction will happen much ...read more.

Middle

Then I will do the same again. I will pour 50cm� of hydrochloric acid into the conical flask (after washing it out from the first time I used it) but this time I will pour only 10cm� of sodium thiosulphate and the remaining 40cm� will be normal tap water. The reason I did not get rid of the sodium thiosulphate all together and just put 50cm� of water was because if I did that the reaction obviously would not happen. So I kept it, but at a small amount. I then time with the stopwatch how long it would take for the reaction to occur again. I made a note of all my results from this experiment in a table which is on the next page. Results These are my results that I got from the first experiment. Vol Hydrochloric Acid (cm�) Vol Sodium Thiosulphate (cm�) Vol Water (cm�) Time (minutes) 50 50 0 2:16 50 10 40 N/A As you can see, these results tell me very little about what I was trying to find out. ...read more.

Conclusion

We can also tell this from the graphs that I drew, by the way the line moves straight from up to down on the graph. Overall I am happy with how the experiment went and am glad that my prediction turned out to be correct. I made sure I did everything properly so I can assume these results are accurate. If I were to do the experiment again I would do mostly the same things as I have done this time but I would be more careful with how I draw on the cross on the piece of paper beneath the conical flask, in case one is drawn on darker than another one therefore staying visible for longer, which would affect my results as I would be stopping the stopwatch later. So to conclude, I am happy with how the experiment went and I now have proof that my prediction before I did the experiment was correct, so it was a success. ...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 Aqueous Chemistry 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

See related essaysSee related essays

Related GCSE Aqueous Chemistry essays

  1. The action of amylase and pectinase in varying amounts when clarifying cloudy apple juice.

    Pectinase is added to crushed fruit such as apples and grapes to reverse the effects of pectin, so increasing the yield and improving the colour. Other liquids, which contain suspended pectin material such as vinegar and wine, are also clarified with pectinases.

  2. Rate of reaction- Sodium Thiosulphate and Hydrochloric Acid.

    However, not all collisions bring about a reaction. A reaction will only occur if the colliding particles possess more than a certain minimum amount of energy. This is known as the activation energy. This activation energy will enable the chemical bonds that already exist between the particles to stretch and eventually break, and atoms, ions and electrons will be rearranged.

  1. Finding out how much acid there is in a solution.

    The plan that I am going to use for this titration, I think is a reliable and accurate method and will give me dependable results. The equipment being used it cleaned out and set-up properly and the chemicals and substances being used are correctly and precisely weighed and measured out.

  2. What factors affect the rate pf reaction between sodium thiosulphate and hydrochloric acid?

    However I did have one anomaly in my results that did not fit the line of best fit very well. The rate of reaction for my 0.045M solution of sodium thiosulphate was 4.2 � 10-3 when it was predicted by my line of best fit to be 3.85 � 10-3.

  1. An investigation to find out how much acid there is in a solution

    When an acid loses a proton, the remaining species can be a proton acceptor and is called the conjugate base of the acid. Similarly when a base accepts a proton, the resulting species can be a proton donor and is called the conjugate acid of that base.

  2. Finding out how much acid there is in a solution.

    Remove the funnel after use as otherwise more solution may drip into the burette from the funnel and an accurate volume would not be recorded. The burette must be filled with 50 cm of sulphuric acid to the 0 cm mark so that the meniscus is just touching the graduation mark.

  1. "What Affects How Quickly Sodium Thiosulphate (thio) Goes Cloudy?"

    2. (0.04M) As you can see from the diagrams, Diagram 1 has 20 atoms, 10 of each, this means that there is less space and there would be more collisions between the atoms. In Diagram 2, there are fewer thio molecules than there are HCl; this means that there

  2. My Aim is to see how concentration of acid will affect the time it ...

    � 4cm � 6cm � 2cm � 8cm From my pilot I have based my prediction on my pilot experiment. The reason I have mentioned giving the 250cm � beaker a thorough washing is because in my pilot one of my results became irregular.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work