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

Chemistry coursework. Rates of reaction

Extracts from this document...


How The Concentration Of The Sodium Thiosulphate Affects The Rate Of Reaction Of Hydrochloric Acid and Sodium Thiosulphate THE PROBLEM What Do You Want To Find Out? I want to find out if as the concentration of sodium thiosulphate decreases the rate of reaction i.e. the rate of reaction is directly proportional to the concentration of the sodium thiosulphate. BACKGROUND KNOWLEDGE What Scientific Knowledge Do You Have Which Might Be Useful In Planning Your Investigation? We have scientific knowledge from preliminary experiment of hydrochloric acid and sodium thiosulphate. Na S 0 + 2HCL 2NaCl + H O + SO + S � � � (aq) (aq) (aq) � (�) � (aq) (s) When 10cm� of 1M HCL was added to 50cm� of Na S O (40g/dm�) after about 60 � � � seconds the sodium thiosulpahte clouded over and prevented us from seeing the x placed on a piece of paper beneath the conical flask. The reaction was exothermic and the bottom of the flask became hot. PREDICTIONS From What You Already Know What Do You Think Will Happen? How Do You Think This Will Happen? ...read more.


From this I shall work out the rate (1/time) of reaction of each concentration. I will then draw a line graph with concentration on the x axis and average rate on the y axis. I will draw a line of best fit and find the mathematical relationships between the concentration and rate. Concentration of Sodium Thiosulphate (g/dm�) Time 1 for Na S O � � � to cloud over (S) Time 2 for Na S O � � � to cloud over (S) Average Time (S) Average Rate (1/time) (S) 40 32 24 16 8 29 38 47 69 169 28 35 46 70 159 28.5 36.5 46.5 69.5 164 0.04 0.03 0.02 0.01 0.006 PRATICAL PROCEDURE Apparatus: Conical Flask Two 50cm�-measuring cylinders Piece of paper with an X on it Stopwatch Chemicals: 50cm� 40g/dm� of Sodium Thiosulphate 10cm� 1M of Hydrochloric Acid Safety: Wear safety glasses Keep apparatus to side of bench Clean spills immediately Diagram: Method: Measure out 50cm� 40g/dm� of Sodium Thiosulphate using a clean and washed measuring cylinder. Place in a conical flask. Measure out 10cm� 1M of Hydrochloric Acid using another clean measuring cylinder. ...read more.


EVALUATING Do You Think Your Method Was The Best Way Of Doing The Investigation? The method I used was a reliable method at this level. It was relatively easy to control the variables and to identify the end part of the reaction. If You Did It Again, What Improvements Would You Make? If I did the experiment again I would make a few improvements: (a) I would use a colorimeter to give an exact measurement of the cloudiness of the solution. (b) We would repeat each experiment more times to ensure it was as reliable as possible but to enable us to do this we would need a lot more time to carry out the investigation. Were There Any Results That Did Not Fit With The Main Pattern? If So, Can You Explain Why? There was one result at 8g/dm� of Sodium Thiosulphate when we repeated it the second time the time was a sufficient amount less than the first time. This could have been because there was a fault in the timing or we possible diluted the solution too much. Do You Think Your Results Are Good Enough To Convince Other People? I believe that these results are accurate enough to convince other science students that my prediction was correct. ...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

See related essaysSee related essays

Related GCSE Patterns of Behaviour essays

  1. Marked by a teacher

    Rate of Reaction Chemistry Coursework

    4 star(s)

    cylinder was quite big and maybe sometimes I was slightly over or under as the figures on the cylinder was a lot larger than 5ml. Other than that I feel like the apparatus that we choose to use worked well and I wouldn't make any changes even if we were to do it again other than the measuring cylinder.

  2. Find out how the rate of hydrolysis of an organic halogen compound depends on ...

    Finding the order of reaction: In order to find the order of reaction, experiments must be carried out. Most reactions involve more than one reactant, and in this case several experiments must be carried out, to find the order with respect to each reactant separately.

  1. GCSE Chemistry Coursework on Rates of Reaction

    The effect of Temperature When gases or liquids are heated the particles gain kinetic energy and move faster. The increased speed increases the chance of collision between reactant molecules and the rate increases. However this is not the main reason for the increased reaction speed.

  2. Rate of Reaction - Sodium Thiosulphate and Hydrochloric Acid Coursework

    come out of the beaker during the experiment, one must still be cautious of spills. We must make sure that coats and bags are all out of the way while doing the experiment. Ties and hair should be tucked out of the way, so they do not make contact with any of the chemicals.

  1. Find out how the concentration of the reactants affects the rate of reaction between ...

    so that the chemicals are not mixed when they are poured into the small beakers and begin to react and also so I can pour the right chemical into the right measuring cylinder I will use a small measuring cylinder for the water to separate the water from the chemicals

  2. Sodium Thiosulphate coursework.

    The stopwatch is then started. When the mixture has sufficiently turned to a cloudy vision, therefore the 'X' can no longer be seen, the stopwatch will be stopped and the time will be recorded. Each concentration will be tested three times each enabling me to calculate the average time.

  1. Science Coursework

    Furthermore the temperature will be room temperature for all parts of the experiment and I will use the same volume of sodium Thiosulphate of an particular concentration. ? The main thing is that because I will investigate the affects of the concentration of sodium Thiosulphate solution on rate of

  2. Investigation exploring rates of reaction, using the reaction between sodium thiosulphate and hydrochloric acid ...

    Surface area is irrelevant in this experiment as both the reactants are liquids, and I cannot increase their surface area. 4. Catalysis catalyst is something added to a reaction that increases its rate but does not get used up.

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