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

See how the pH and the temperature levels change during an acid/base titration using the indicator and thermometer method.

Extracts from this document...


GCSE Chemistry Coursework on a Titration Aim To see how the pH and the temperature levels change during an acid/base titration using the indicator and thermometer method. Results Tables Analysis of Results From my graphs that I have drawn on the previous four pages, I can conclude that adding any amount of acid to a solution of alkali will result in a change of pH value, colour and temperature. This is very clear, despite the fact that I managed to achieve some anomalous results during my experiment. This error only occurred during the 2 Molar solution experiment where the temperature and colour was recorded and not in the 0.5 Molar solution where the pH value and colour was recorded. For the 0.5 Molar solution, as the amount of acid added to the alkali increases the pH value of the solution decreases at quite a steady rate until it reaches pH 7 (neutralisation) and then the pH value decreases very quickly. Between 24cm3 and 27cm3 of acid added to the alkali the pH value dropped from pH 8 and pH 9 respectively to pH 1. ...read more.


The graph of the acid added against amount of temperature shows a positive correlation up to 27cm3 of acid added and then also shows the signs of a negative correlation between 28cm3 and 30cm3 of acid added. I have found that for the thermometer method, the temperature was inversely proportional to the amount of acid that was added to the alkali. Also, before the neutral point, the temperature started to increase quickly and then slowed down as it got closer to the neutral point. This may have happened because at the start of the experiment there was less liquid in the beaker for the reaction to heat. As acid was added, this meant that there was more liquid for the reaction to heat, and so the rate of temperature increase would have started to slow down as you got closer to the neutral point, where the temperature started decreasing. Another reason for the slow increase in temperature was that the acid was cooler than the alkali when it was added. ...read more.


be poured into it * An alternative piece of equipment than a burette should be used to make sure that the correct amount of acid is poured into the beaker containing alkali. I suggest using a 2ml syringe to slowly pour the acid in as the results will be more accurate * You could also keep adding more and more acid to the alkali and see how the temperature of the solution is affected and draw a graph to show your findings * The main problem that was affecting the results of the thermometer method was that the room temperature was changing and never remained at a constant temperature. There was no way of controlling the temperature in this experiment unless it was done in a laboratory under controlled conditions If I had had enough time, I would have repeated my experiment for each molar solution two times and take an average of the results so that I can get a more accurate result. I would have also taken more readings closer to the point of neutralisation to make sure that I got a more accurate result. Khushpal Grewal 11K ...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

    Enthalpy of Neutralisation.

    3 star(s)

    * In order to make accurate predictions concerning the relative energy levels of reactants and products, it is necessary to consider the energy lost or energy gained by the reacting system, and also any energy changes inside that system. For example, when a gas is produced in a reaction, or

  2. Investigating the effects of varying pH levels on the germination of cress seeds

    of Sulphuric Acid did not germinate at all, whilst the remaining samples germinated at different rates. The remaining samples all reached 100% germination by day two, although the samples with the lowest concentrations of Sulphuric Acid had almost doubled the % germination of others after day one.

  1. Determination of the equilibrium constant for esterification of ethanoic acid and propan-1-ol by using ...

    Moreover, the volume of deionized water added doesn't affect the number of moles of reactants in the 1 cm3 sample. Thus, deionized water can be added to the sample before each titration. 2. Why should the sample be titrated immediately after the addition of conc.

  2. Calibrating pH meters

    This depends whether the chemical is hazardous or not most lab spillages are on a minor scale and can simply be wiped up by using a damp cloth. With hazardous spillages do not attempt the spillage seek someone qualified to attend to the spillage.

  1. Establish what types of soil holds the most water and to see if changing ...

    However, the results showed otherwise with the total absorption for sandy soil being over double the absorption for woodland soil. It was predicted that clay would hold the most soil because it has a large surface area allowing water to be absorbed at a faster rate, especially evident because the investigation took place on a time limit.

  2. Investigate the heat of neutralisation when an acid and an alkali (a soluble base) ...

    If a dibasic acid and a strong alkali are mixed I think that the amount of heat given off will be very high. I reckon that when a weak acid and weak alkali are added they'll have a lower amount of heat given out than if two strong solutions were added.

  1. Energy Change Associated With Neutralisation

    This means there is some unused energy. This energy is then dispersed in the form of thermal energy to the surroundings. This thermal energy will cause the temperature of the product to he higher than the start temperature of the two reactants. If the strength of the acid is reduced, the temperature of the product will decrease.

  2. Find out the percentage of citric acid present in lemon squash by using a ...

    because then I might by chance pour too much and not realise, this way if I pour too much in one at least in then there would be a shortage in one beaker and I would realise. Also, if the volume wasn't constant then I wouldn't be able to compare any results accurately.

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