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

An Investigation into the heat changes when acids and alkalis are mixed.

Extracts from this document...

Introduction

An Investigation into the heat changes when acids and alkalis are mixed. Simple Procedure: The aim of this experiment is to investigate how the heat capacity changes when different combinations of weak and strong acids and alkalis react. In order to do this an acid of volume 40cm3 was placed in a polyester cup (was placed inside a beaker) which contains 40 cm3 of alkaline and by using a thermometer the temperature of the two substances were taken when they had reached a constant temperature. By using this temperature the heat capacity of the reaction was calculated. A diagram of the apparatus used in order to conduct this experiment is shown below: There are basically three stages to each experiment being conducted. The apparatus as illustrated above are going to be used. There are going to be four experiments conducted as shown below: The Strength of Substances Being Tested. ...read more.

Middle

2) Make sure that the same type (same area and same material) of cup is used in place of each experiment. Explanation: Again by insuring that the same type of cup is used in each experiment it removes variables such as surface area from each experiment. 3) The cup is placed in a beaker, when swirling the two mixture in the cup care must be taken in order to ensure that one does not put ones hand around the beaker as this may warm up the mixture in the beaker from the body heat which is generated. It is therefore advisable to use the thermometer in order to mix the substances. Explanation: This again is put in order to ensure that extra heat does not affect the experiment in any way and the only variable is the strengths and weakness of each acid or alkali. ...read more.

Conclusion

OH-(aq) OH-(aq) Table of Results: Reaction Experiment 1 Experiment 2 Starting Temperature (�C) End Temperature ( � C) Temperature Change Starting Temperature ( �C) End Temperature (�C) Temperature change. Average Temperature change. NaOH+ HCl 16.5 29.5 13.0 17.0 29.7 12.7 12.85 NaOH + CH3COOH 16.6 29.0 12.4 18.5 31.0 12.5 12.45 NH4OH+ CH3COOH 17.5 29.5 12.0 17.0 29.5 12.5 12.25 NH4OH+ HCl 16.8 29.4 12.6 17.0 30.0 13 12.80 Some Safety Points Whilst doing the experiment some safety points had to be considered as shown below: - Firstly at all times safety goggles were worn - to prevent any chance of these chemicals coming in contact with the eyes - It was advisable to have good ventilation in the room where the experiment was being conducted. This is because it was found that Ammonium Hydroxide has a very potent smell. - The chemical Sodium Hydroxide is corrosive therefore, hands must be washed carefully. - The thermometer in use during the experiment was a mercury thermometer therefore extra care was taken in order to not break it. Nabil Choudhury 11C Planning ...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. Marked by a teacher

    Investigation into the effect of acid/alkali strength on the heat change when acids and ...

    5 star(s)

    Diagram of apparatus 2x50cm3measuring cylinders Polystyrene cup Thermometer 75cm3 beaker 40cm3 of hydrochloric acid 40cm3 of ethanoic acid 40cm3 of sodium hydroxide 40cm3 of ammonium hydroxide The 20cm3 acids (hydrochloric acid and ethanoic acid) will be measured accurately in 50cm3 measuring cylinders. The same will be done for the alkalis.

  2. Marked by a teacher

    Enthalpy of Neutralisation.

    3 star(s)

    I should use extremes like this so I can get strong results which are easy to test for and therefore very conclusive. I will use hydrochloric acid, HCl, Sulphuric acid, H2SO4 , sodium hydroxide, NaOH, and Ethanoic acid, CH3COOH as the acid and alkali for my investigation.

  1. Marked by a teacher

    Heat of Neutralisation - I am going to investigate the heat of neutralisation between ...

    3 star(s)

    2. Measure 5cm3 of alkali and record temperature. Add to the acid and take the maximum temperature. 3. Keep on adding 5cm3 of alkali and stir, recording the maximum temperature each time. 4. Keep doing this until you have added 50cm3 of alkali.

  2. To investigate the effect of concentration on the temperature rise, heat evolved and heat ...

    40.00 40.00 40.00 45.00 39.00 39.00 39.00 50.00 38.00 38.20 38.10 I have repeated my experiment twice for all the three concentrations of acid and alkali so that I will get an accurate enough average results of these two experiments.

  1. Investigation to find out the factors affecting heat of neutralisation, and then choosing one ...

    - (60 * 4.2 * 5.3 /1000 / 0.03) = 1. - 41.2 KJmol-1 2. -42.8 KJmol-1 3. -44.5 KJmol-1 To find an average of these figures: - (41.2 + 42.8 + 44.5) /3 = - 42.8 KJmol-1 Table 3- showing average heats of neutralisation for each pair of chemicals, to extend original findings HCl CH3CO2H CH3CH2COOH NaOH -56.3

  2. Specific Heat Capacity

    As the results to this experiment are so far out and it is difficult to minimise the error, as it is very difficult to find adequate insulation, I needed to find a more suitable method to find the specific heat capacities.

  1. Investigating the kinetics involved in the reaction of metals with acids.

    Firstly, measure out 20cm3 of 0.5M-3M of hydrochloric acid into separate beakers. Pour the 20cm3 of 0.5M acid into a dry conical flask, which should be washed and dried after each reaction to prevent excess acid reacting with the magnesium.

  2. Obtain pure samples of Ethanol (CH3CH2OH) and Ethanoic Acid (CH3COOH) from fermented Yeast (Saccharomyces ...

    PRACTICAL 3 Oxidation of the Ethanol to Ethanoic acid In this experiment the Ethanol will be oxidised to Ethanoic acid. This will be achieved by boiling gently under reflux with acidified Sodium dichromate (VI). Before refluxing, the starting volume of ethanol will be recorded.

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