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

Gravimetric analysis for Chloride Ion.

Extracts from this document...


Lab Y: Gravimetric Analysis for Chloride Ion Erika Johnson Hans Davina Chemistry 112 - Section L07 October 2nd, 2003 Introduction: The purpose of this lab is to determine the mass and percentage of the chloride ion in a given solution. A precipitate is formed when any solution that contains the chloride ion is mixed with silver nitrate. The precipitate is silver chloride. The weight of chloride in the solution can de determined by weighing this precipitate and calculating the percentage of chloride present in silver chloride. The percentage weight of chloride in the sample can be determined if the weight of the chloride salt is known. Silver Chloride (AgCl) is a chemical compound. It is a white, cubic solid. Silver chloride is almost insoluble in water and it decomposes into atomic chlorine and metallic silver. Nitric Acid (HNO3) is a strong acid and a powerful oxidizing agent. It has the ability to nitrate many organic compounds. Acetone, or dimethyl ketone, is a chemical that can be found in the natural environment but is also manufactured. ...read more.


6. The solution was removed form the hot plate and cooled until room temperature. 7. Then an extra drop of silver nitrate solution was added to the solution to see if any further precipitate formed. It did not. 8. A clean dry filter crucible was then weighed on an analytical balance. 9. The solution was then filtered through the crucible. A rubber policeman was used to ensure all the solid was out of the beaker (which would result in weight measurement errors). The remaining solid that was stuck to the beaker, the policeman, and the stirring rod were rinsed off using distilled water into the crucible. 10. 40mL of 0.02M nitric acid was rinsed over the precipitate and through the filter. 11. Then 25mL of acetone was washed over the precipitate and through the filter in attempt to dry it. 12. The precipitate was then placed in an oven at 160�C for 15 minutes. 13. The crucible was cooled time, then weighed on an analytical balance. ...read more.


The first common error in data may have occurred by simple human error. There might have been some over or under measuring that could have occurred or some of the sample may have gotten spilled. There may have been some of the silver chloride precipitate still stuck on either the beaker, the rubber policeman or the stirring rod that may not have been washed into the crucible. This would result in a slight error in the weight of the precipitate. Another source of possible error would be that when carrying the crucible, if held in hands rather than in a beaker or tongs, fingerprints and oils from hands may have gotten onto the crucible and would also alter the weight. Conclusion: It was found that the unknown sample #547 contained 52.39% of the chloride ion. This was determined by dissolving the sample in distilled water, acidifying the solution, adding silver nitrate to form a precipitate (silver chloride), weighing the precipitate and calculating the mass of chloride present in the silver chloride. Then using the mass of silver chloride and the mass of the unknown sample, the percentage of chloride ion present in the sample was calculated. ...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. Determine BaCl2.2 H2O -Gravimetric Analysis Lab

    the 2g mass of hydrated barium chloride. See, the problem here is that it gets more risky when measured small amounts because it ends up having a higher probability of an error occurring. On the contrary, if I were to measure big amounts it wouldn't have mattered as much as

  2. chemistry open book:formation of natural and synthetic rubber

    5% Curing agents 4% Anti-ageing chemicals 2% Figure 12 The table above shows the contents of a tyre Carbon black is added to improve the properties of rubbers, it helps to give the rubber# more strength, increase resistance to cuts, grazing, and tearing, and also helps prevents rubbers eroding in sunlight.

  1. should salt be banned?

    "But by adding extra salt to a meal, you are only making things worse." The bulk of salt in the UK diet comes from processed foods such as bread but Prof Wiseman said consumers could take action themselves, by cutting the amount added both during cooking and to the food on their plates.

  2. Our experiment consisted of two samples of water containing unknown substances, and our objective ...

    Opening up the nozzle means more oxygen and come through, the resulting flame can combust more and therefore it will be hotter and have a dark blue colour. 6. We need to scoop up the substance so it can be tested.

  1. Whats in the bottle?

    20/03/09 Presentation IR Spectroscopy Lesson Write-up IR Spectroscopy - What's in the Bottle? IR stands for Infra Red (this is part of the electromagnetic spectrum) It is used to identify functional groups in organic results. Alkanes - A hydrocarbon containing only simple C-C bonds.

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

    * Lower Inventory carrying costs. * Expensive and Inflexible production facilities. * Highly flexible production facilities. * Lower variable production costs. * Higher variable production costs. * Requires efficient Inventory Management System * Require richer information flows * Product centric * Customer Centric * Lower consumer waiting time * Higher consumer waiting time.

  1. To conjecture the structure and bonding of eight unknown solids by analysis of experimentally ...

    leave power pack off when not in direct use) * Do not touch un-insulated portion of graphite rods when power is running * Start ammeter set to 5 Amps * Avoid unprotected contact with substance E RESULTS: Testing - Polar Solutions: A, C, F, G - Non-Polar Solutions: D, E - Solids: B, H A Table to Show the

  2. Identification of an unknown compound.

    Finally, add aqueous ammonia until the brown precipitate dissolves. This solution is tollens reagent, add to this, 1cm3 unknown compound. If an aldehyde is the organic unknown compound, a 'silver mirror' will form on the test-tube. However if no silver deposits are observed then a ketone will be identified as the unknown chemical.

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