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

Comparing the solubility's of copper sulphate, sodium chloride and potassium nitrate.

Extracts from this document...

Introduction

Comparing the solubility's of copper sulphate, sodium chloride and potassium nitrate Comparing the solubility's of copper sulphate, sodium chloride and potassium nitrate Background Information Molecular solids (sugar) and ionic solids (salts) both dissolve in water. However, they both dissolve in different ways. The intermolecular forces holding molecules of sugar together are relatively weak so when sugar is placed in water these bonds are broken and individual C12H22O11 molecules are released into solution. It takes energy to break bonds between C12H22O11 molecules and it also takes energy to break the hydrogen bonds in water. These hydrogen bonds have to be disrupted in order to insert a sugar molecule into the substance. The energy needed for this is produced by the forming of bonds between slightly polar sucrose molecules and polar water molecules. This process works so well between sugar and water that up to 800g of sugar can dissolve in 1 litre of water. The positive and negative ions in ionic solids (or salts) are held together by the strong force of attraction between particles with opposite charges. When a salt dissolves in water the ions are released and become associated with the polar solvent molecules. ...read more.

Middle

3. Potassium Nitrate - Colourless crystals. May ignite combustible materials. (KNO3) May evolve toxic fumes. Prediction Below is information from a data booklet: Copper Sulphate - 1.39 � 10� moles dissolve in 100g of water. Sodium Chloride - 6.15 � 10� moles dissolve in 100g of water. Potassium Nitrate - 3.75 � 10� moles dissolve in 100g of water. Working out the quantities that will dissolve in grams shows that according to this information 29.12g of copper sulphate will dissolve, 35.98g of sodium chloride will dissolve and 37.88g of potassium nitrate will dissolve in 100g of water. I carried out some preliminary tests that showed that more of the salts dissolved as we increased the temperature. Obviously these tests could be accurate, as I did not have time to plan them carefully. However, they do show that as the temperature was increased, the solubility also increased. Having looked at the information given by the data booklet and my own preliminary work, I think that as the temperature increases the solubility of all the salts will increase. Equipment 3 boiling tubes, a burette, a thermometer, ceramic mat, Bunsen burner Method Weigh out about 10g of copper sulphate and record its mass. ...read more.

Conclusion

Again take a new boiling tube and place the potassium nitrate in it. Repeat the method above taking readings from the same volumes of distilled water. Now repeat the whole experiment another two times and average the readings you get. Ignore any readings which are completely different to the other two as these will probably be due to an error. Now work out the solubility of each salt at different temperatures per 100g of water. For instance if 10g of copper sulphate dissolves in 20cm� of water then the solubility of copper sulphate at the temperature you recorded will be 50g per 100g of water. Once you have worked out all the solubility's at different temperatures you can plot a solubility curve graph. Put solubility per 100g water on the vertical axis and temperature on the horizontal axis. Plot the points for each salt and join them with a line of best fit. Now you should have three separate solubility curves on the same graph. Sources of Error Human error -it is very hard to tell the exact temperature at which crystals come out of the solution, so mistakes here are probable. To reduce the chance of error use the same thermometer and the same person taking the readings. ...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

    The effetct of copper nitrate on the germination of mustard seeds.

    * the same apparatus needs to be used, in order to allow for consistency. Justification of measuring equipment and techniques In order to conduct the experiment in as a relaible manner as possible, thereby diminshing the chance of anomalous results occuring, the procedure of measuring the changes in growth in

  2. Peer reviewed

    Formula of a hydrated salt

    4 star(s)

    This may have again affected the mass reading and the overall calculations, resulting in inaccurate results. To improve the experiment and the accuracy of results I could firstly try finding brand new clean crucibles or clean the crucibles for longer until all other substances are removed.

  1. Determine Solubility of KClO3 Salt.

    The solubility of the salt will outcome whether the food is tasty if the salt is solute proper into the soup or foods or too sour if the salt is putting too much where it can't be dissolve into the soup or foods.

  2. Investigate how the solubility of Potassium Nitrate is affected by Temperature.

    then the reaction will not proceed and the KNO3 cannot dissolve in the water. In order for KNO3 to be dissolved, it must come into contact with water molecules. The collision between the water molecules and KNO3 generates energy which, if strong enough allows the reaction to take place causing the KNO3 to dissolve.

  1. Find the solubility of potassium nitrate in water at different temperatures and to estimate ...

    After recording the results in my table, I will then add a further 2.0 cm� of distilled water to the mixture in the boiling tube. I will then repeat the heating process to obtain a solution and then repeat the procedure to find the temperature at which crystals first appear.

  2. Investigating the Effects of Increasing Copper Sulphate Solution Concentrations on the Germination of Cress ...

    On each layer of filter paper, I will place 15 seeds, with enough space between each for germination. The seeds will be fresh from the packs which they have arrived in. This is so that there is the same number of seeds in each batch, so they are all equal

  1. How much Iron (II) in 100 grams of Spinach Oleracea?

    Average Titre = 7.30 + 7.30 + 7.20 3 = 7.27cm3 Experiment Seven - How much Iron (II) can be extracted from 20 grams of Spinach Oleracea when boiled in Distilled Water(l) Experiment A - preformed using a spinach extract solution created by boiling 20 grams of spinach in Distilled Water (l)

  2. Free essay

    Investigation of aqueous electrolytic cells.For this experiment, we are to test an aqueous solution, ...

    the experiment constant each time I do it and to make it a fair test. Method: Materials/ Tools: * 100ml of copper chloride * 1 power unit * 2 carbon sticks * 2 crocodile clips * 2 connecting wires * 100ml beaker * Safety goggles * 1 thermometer * 1 timer * 1 electronic balance 1.

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