• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10

Investigating the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate.

Extracts from this document...

Introduction

Investigating the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate PRELIMINARY EXPERIMENT Introduction: - In this experiment, I will be investigating the factors that affect the rate of reaction between hydrochloric acid and sodium thiosulphate. There are several variables that affect the rate, such as: * Temperature * Concentration * The surface area I will be investigating how the rate of reaction is varied by the concentration of sodium thiosulphate. When doing this, sodium chloride, sulphur dioxide and water are formed. Water and sodium chloride do not affect the results of the experiment. The word and symbol equation for the experiment is: Na2 S2 O3 (aq) + 2HCl (aq) 2NaCl (aq) + S (s) + SO2 (g) + H2O (l) Sodium + hydrochloric sodium + sulphur (s) + sulphur + water (l) Thiosulphate (aq) acid (aq) chloride (aq) dioxide (g) I will be testing how long it takes for the solution to go cloudy. It will go cloudy as the sulphur is formed. I am able to tell that it is sulphur as it is the only substance that forms a precipitate. I can also test for sulphur dioxide as it turns damp litmus paper red. ...read more.

Middle

I will also draw a cross on a piece of paper and place it under the conical flask. When the cross is no longer visible, then I will stop the stopwatch. This is a more accurate way of timing how long it takes for the sulphur precipitate to form. In the preliminary, I was timing how long the reaction took by just looking into the boiling tubes and estimating when the solution had gone cloudy. This method was not very accurate as the cloudiness of the solution could have been different each time. I will do the experiment at intervals of 0.3 mol/dm3, repeating the experiment after each reading. This is so I can take an average of the results that I have collected. This also gives me more reliable results. To change the volume of sodium thiosulphate, I had to add distilled water. The following amounts of distilled water and sodium thiosulphate were added to each conical flask: Concentration (mol/dm3) Volume of distilled water (ml) Volume of 0.15 mol/dm3 sodium thiosulphate (ml) 0.03 40 10 0.06 30 20 0.09 20 30 0.12 10 40 0.15 0 50 Results: Concentration (mol/dm3) Time (seconds) ...read more.

Conclusion

A light beam would be placed underneath the conical flask, and a sensor above it. The sensor is then connected to the computer. When the sensor can't detect the light beam due to the amount of sulphur collected, the end point has been reached. The computer records the time taken. The sensor and light beam should be kept at the same distance away from the conical flask each time to make the experiment accurate. This is a more accurate way of distinguishing when the solution is cloudy. When the light beam goes out, this means that the same amount of sulphur has been collected in each experiment. Also, better standard of measuring cylinders and pipettes could have also been used. Also, when pouring the acid into the conical flask, there may have been some acid left behind in the measuring cylinder, making the acid content not exactly 10 ml for each experiment. This could have made the experiment unfair. Instead, we could have used measuring burettes. These would have been more accurate as they have taps, which we can turn on and off, therefore increasing the reliability of the results. Another factor that could have affected the results is the timing. The stopwatch could have been started and stopped at different times, which would also make the experiment unfair. ...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. Free essay

    Close Your Eyes

    messy bun with just one piece falling in front of her eye. Her tanned skin glowed in the light and for a moment I was hypnotised. "Thanks" she gave me a smile and then glanced at the door as Dougie and Harry walked from the front room to where everyone else was.

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

    This may have been due to procedural error or error in measuring quantities of the substances, or it may have been an error in the reading of the conductance meter (the meter may not have been positioned properly) - this was my fist time in handling a conductance meter.

  1. Experiment to Investigate the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate, with ...

    This means that the time taken for the reaction to take place increases at an increasing rate as the concentration of the sodium thiosulphate decreases. This is because when a reaction occurs the reactant particles become used up during successful collisions.

  2. The reaction between Sodium Thiosulphate and Hydrochloric Acid.

    Sulphur dioxide may trigger and asthmatic attack and people who suffer from asthma should avoid using it. If released, open a few outside windows and let the gas disperse into the outside air. To dispose of sulphur dioxide, use an efficient fume cupboard to vent the gas and make sure

  1. Investigation of the rate of reaction of sodium thiosulphate with dilute hydrochloric acid.

    I would also have tissues so that after every reading that I take, I wash the conical flask and then dry it up. I would also need to wear safety goggles and a lab coat because hydrochloric acid is obviously corrosive, and although it is diluted it would be nasty if some of it gets on cut or your eyes.

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

    I will ensure the measuring cylinders for the reactants do not get mixed up, by labelling them. The amount of HCl used in every experiment will be kept constant; likewise the amount of sodium thiosulphate will remain the same. Key variables Output variable-time taken to produce sulphur, clouding the solution

  1. Sodium thiosulphate and hydrochloric acid Investigating how the rate of reaction is affected ...

    The rate of reaction can be affected by a number of factors: temperature, concentration and pressure, adding a catalyst, surface area/particle size and light. The one that I am going to be investigating and explaining about is Temperature. Changes in temperature change the kinetic energy of the particles and hence

  2. To see the effects of a change in temperature and concentration on the rate ...

    are poured out into two measuring cylinders. A beaker is half filled with hot water from a tap. The water is placed on top of a Bunsen on a blue flame and the two measuring placed inside the water bath.

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