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

Investigate the Rate of Reaction between Sodium thiosulphate and Hydrochloric Acid.

Extracts from this document...

Introduction

INVESTIGATE THE RATE OF REACTION BETWEEN SODIUM THIOSULPHATE AND HYDROCHLORIC ACID. THEORY: Sodium thiosulphate and hydrochloric acid, react together to produce sulphur as one of the products Na2S2O3 (aq) + 2HCl (aq) Sodium Thiosulphate + Hydrochloric acid --> 2NaCl (aq) + H2O (l) + S (s) + SO2 (g) Sodium Chloride + Water + Sulphur + Sulphur Dioxide Sulphur is a yellow precipitate, so the solution will turn an opaque yellow colour while the reaction is occurring. The reaction will continue and eventually the solution will turn completely opaque. AIM: - the aim of this experiment is to show the effect on the rate of reaction, when the concentration of one of the reagents changes. Variables Dependant Variable: - Variable that is measured. This will be the time, from when the HCl is added to the Na2S2O3, until the solution goes yellow and opaque, when a cross, which is written on a label placed underneath the reaction, can not be see. Independent Variable: - Variable that is changed. This will be the concentration of Na2S2O3. Controlled variable: - There are four variables that may affect the experiment and the results. These are concentration and volume of HCl, the same person with the stopwatch, the same apparatus, temperature these could all affect the results. I. Concentration and volume of HCl : - If the concentration is increased then the number of particles in the solution increases. ...read more.

Middle

(c) Take a one sided sticky label, and with a thick marker draw a cross on the sticky side, then stick this label on the bottom of the conical flask. (d) Measure 5cm3 of sodium thiosulphate in the 10cm3 measuring cylinder. (e) Take the same measuring cylinder and fill up to the 30cm3 mark with water. Then pour all of the contents into conical flask. (f) Take 10cm3 measuring cylinder and measure 10cm3 of hydrochloric acid. (g) Pour this into the conical flask and immediately start the stopwatch. (h) When the cross is not visible when looking from above the conical flask, then stop the timer and record the time on the table. (i) Wash out the apparatus as not to cause any contamination for the next time, so that there are chemicals left, which could affect results. (j) Repeat steps (a) - (f), but using 25cm3 of sodium thiosulphate, then repeat steps (a) - (f) again, but using 30 cm3 of sodium thiosulphate, these large amounts can be measures out in a 50 cm3 measuring cylinder. (k) Repeat steps (a) - (g) using 5cm3 instead of 10cm3 of hydrochloric acid. Then repeat steps (a) - (g) again using 15cm3 instead of 10cm3 of hydrochloric acid. (l) Repeat steps (a) - (g), but change the concentration of hydrochloric acid, and keep the concentration of sodium thiosulphate constant. Results Experiment Volume of Hydrochloric Acid (cm3) Volume of Sodium Thiosulphate (cm3) Volume of Water (cm3) Concentration of Sodium Thiosulphate (M) ...read more.

Conclusion

How to control variables that could affect my results. I will make the test fair, by controlling the person using the stopwatch, which will be me; therefore my reaction time will stay the same and therefore reducing errors. I will clean out the apparatus each time, so that the apparatus is not contaminated, also I will use the same apparatus. Temperature is very hard to control, I can not make sure that it is exact, but the experiment will happen under room temperature, which will be about 22 oC, and I will keep my experiment away from anything, which could potentially heat up the experiment, e.g. Bunsen flames and radiators. The concentration of HCl will be the same, as we will not be making the concentration, but be provided with it. The volume of hydrochloric acid, we can measure to the closest 0.5 cm3, there will be a little amount of error, but not much. This is how I will record my results. Experiment Volume of Hydrochloric Acid Volume of Sodium Thiosulphate Volume of Water Concentration of Sodium Thiosulphate Time Rate (cm3) (cm3) (cm3) (M) (s) (s-1) 1 10 5 25 0.0833 - - 2 10 10 20 0.167 - - In addition, I will create a scatter graph for time against concentration of sodium thiosulphate, and draw a best of best fit. I will also draw a scatter graph of rate of reaction against sodium thiosulphate, with a line of best fit. Varun Garg 5D: Chemistry Coursework: Plan Page 1 of 8 ...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. Experiment to Investigate the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate, with ...

    0.12 Mol.dm-� the rate is 3.55 (X 10-�), and at 0.09 Mol.dm-� the rate is 2.61 (X 10-�). This happens because the time for the reaction to occur takes longer so the rate of reaction is lower. The data in the Results Table 1 also shows that when there was

  2. The reaction between Sodium Thiosulphate and Hydrochloric Acid.

    The final adjustment to my procedure that I would make would be what I mixed my reactants in. When I conducted the experiment I used a boiling tube, but I was finding that putting 50cm3 of liquid into the boiling tube was nearly making it overflow.

  1. Investigating the rate of reaction between Hydrochloric acid and Sodium Thiosulphate by varying the ...

    Temperature: 'The hotter something is, the quicker the particles in it move.' (Kinetic theory). This shows that the hotter the solution is, the quicker the particles in it will move, therefore they will collide more often and they react more quickly because they react as they hit.

  2. To investigate the effect of varying the masses of white sugar and yeast and ...

    Very Complex sugars: The main very complex sugar is starch, which represents about 70% of the flour content. Two types of starch are found in flour: amylose and amylopectin. Amylose is degraded by the enzyme beta amylase into maltose, and in turn the maltose will be degraded into glucose by the maltase enzyme.

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

    They are not changed chemically, though sometimes they may be changed physically. For instance, the surface of a solid catalyst may crumble or become roughened. This suggests that the catalyst is taking some part in the reaction, but is being regenerated. Only small amounts of a catalyst are usually needed.

  2. How does temperature affect the rate of reaction between either; a) 250 cm ³of ...

    In this experiment I will be changing the temperature and investigating how this affects the rate of reaction. The rate is a measure of the change that happens in a unit of time. For example how fast or slow Sodium Thiosulphate ( Na2S2O3)

  1. How does the Temperature affect the Rate of Reaction between Sodium Thiosulphate and Acid?

    Then 5cm3 of hydrochloric acid will be added to the solution of sodium thiosulphate and water. 8) The stopwatch will immediately be started. 9) As soon as the cross has disappeared from sight the time will instantly be recorded.

  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.

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