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

An investigation to compare the % by mass of calcium carbonate in a variety of common rocks.

Extracts from this document...

Introduction

An investigation to compare the ? by mass of calcium carbonate in a variety of common rocks. My aim is to accurately determine the ? by mass of calcium carbonate in 4 common rocks. To do this I will need to investigate the physical and chemical properties of suitable rocks and decide upon an appropriate practical procedure to achieve satisfactory results. I will also need to consider practicality, as resources are limited. All rocks are made of minerals and these minerals have certain predictable properties. Rocks can be dissolved, diluted, decimated, decomposed, etc. However I think the most appropriate process would either be a titration involving hydrochloric acid (CaCo3(s) + 2HCl(l) ? CaCl2(aq) + CO2(g) + H2O(l)) or a thermal decomposition (CaCo3(s) ?Heat? CaO(s) + CO2(g)). The titration would involve a reaction between the rock and hydrochloric acid, which will give off carbon dioxide, which would be measured and used to calculate the results. The thermal decomposition would 'break down' the calcium carbonate into Calcium oxide and carbon dioxide, either of which could be measured and used to calculate the mass required. ...read more.

Middle

Heat with a roaring blue flame, recording the weight every 5 minutes until there is no mass loss 5. Take the final weight from the initial weight to give the mass loss 6. Repeat as above for magnesium carbonate Results: CaCO3 (in g) MgCO3 (in g) 10 mins 10.921 13.186 15 mins 10.876 13.178 20 mins 10.806 13.172 25 mins 10.761 13.172 Crucible mass 8.183 12.765 Initial mass 11.184 13.769 Total mass loss 0.432 0.597 The calcium carbonate had not finished decomposing but it is clear to see that the magnesium had ceased to decompose after losing nearly 0.6g. This test re-enforces the evidence for a thermal decomposition being the best option as it clearly distinguishes between the two carbonates. So from this it can be acknowledged that magnesium carbonate will decompose before calcium carbonate. Test 2- this test will demonstrate how easily calcium carbonate will decompose compared to magnesium carbonate. 1. Weigh crucible 2. Add calcium carbonate and re-weigh 3. Heat over a gentle blue flame for 5 minutes 4. ...read more.

Conclusion

to give the mass loss of calcium carbonate 10. Using information from previously stated sources that for every CO2 molecule given off, there remains one molecule of CaO and for every mole of CO2 given off, there is one mole of CaCO3. 11. Subtract the mass of CaO remaining from the mass of the other remaining substances and add it to the mass of CO2 lost. This will give the mass of CaCO3 that was in the rock 12. Work out the percentage of CaCO3 that was originally in the rock Calculations: In order to demonstrate the scientific calculation, I will use some 'convenient' numbers. Example results: Total mass of sample = 50g Mass loss of CO2 = 5g (Number of moles = mass / mr) (Mass = number of moles x mr) Example calculation: Moles of CO2 = mass CO2 / mr CO2 = 5 / (12+(16x2)) = 0.113636 mol dm-3 Moles of CO2 = moles of CaCO3 Therefore moles CaCO3 = 0.113636 mol dm-3 Mass CaCO3 = moles CaCO3 x mr CaCO3 = 0.113636 x (40+12+(16x3)) = 11.3636g Therefore ? by mass of CaCO3 = (Mass CaCO3 / total mass of rock sample) x 100 = (11.3636/50) x 100 = 22. ...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 Classifying Materials 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 Classifying Materials essays

  1. Peer reviewed

    Rate of reaction between Calcium Carbonate and Hydrochloric Acid

    4 star(s)

    will also increase. I am using different concentrations of HCL and timing how long will the reaction take to produce CO2. The methods basic plan is 'How much volume of CO2 produced in how much Time.' Method- Step-by-Step 1) Set up apparatus as shown in the diagram Fig1.0.

  2. To investigate the thermal decomposition of copper carbonate and try to prove that the ...

    draw up my results into one graph instead of having to draw three. Mass grams Crucible + lid grams Mass + crucible + lid grams Copper carbonate + mass + crucible +lid grams Copper oxide + mass + crucible +lid grams Mass of CuO grams Mass of CO2 lost grams

  1. Rate of reaction of hydrochloric acid on magnesium.

    So I had chosen to monitor the amount of the gas produced every 15 seconds. I had calculated the average by the three trials that I had investigated on. I have decided to approach this experiment another way when I do my actual rate of reaction experiment.

  2. The rates of reaction between CaCO3 and HCL

    So after each experiment I will have 13 results I am going to repeat the experiment 3 times with each sample this decreases the margin of error giving me more accurate results also if I repeat three times I can identify any anomalous results and calculate arrearages.

  1. Ions - a qualitative analysis on our chemicals by flame testing.

    The combustion flame was received by opening the air whole. Once the sample was within the flame a closed eye had to be kept on it so we didn't miss the colour of the flame change. After the colour of the flame had changed the metal wire wash washed in

  2. The role of mass customization and postponement in global logistics

    development, merchandising, cutting, assembly, finishing and warehousing segments of your business wherever they are the most cost-effective? What if you could continue to communicate with your employees as effectively as if they were in the same building? What if you could share information with key suppliers and customers as if they were co-located in your facilities as full partners?

  1. Investigation into how mass affects the rate of fall.

    If the mass increases then so will the weight. When the weight increases, then the speed that it falls at increases. Below is an example that shows that the gravitational force strength depends on the mass. If the gravitational field strength is 10n1Kg and the mass of the rocket is

  2. Bonding Practical

    If it is not definitely clear whether the sample has dissolved I will test the pH of the solution. If the substance has dissolved the colour of the mixture will change from the colour of distilled water. The only equipment needed for this experiment would be a beaker, a stirring rod and some universal indicator.

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