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

Titration of an Unknown Potassium Halide Against Silver Nitrate

Extracts from this document...


Titration of an Unknown Potassium Halide Against Silver Nitrate Apparatus * 250cm3 volumetric flask + 0.3cm3 * 25cm3 pipette + 0.06cm3 * Filler * Conical flask * 50cm3 burette + 0.05cm3 * Retort stand and burette holder Chemicals * 1.035g + 0.001g unknown potassium halide * Distilled water * 0.1moldm-3 Potassium chromate indicator * 0.05moldm-3 Silver Nitrate Solution Data Collection Mass of solid white Unknown potassium Halide used: 1.035g +0.001g. This was made up to a 250cm3 colourless solution. 0.1moldm-3 yellow potassium chromate indicator was used in this titration. The end point was judged to be when a dark pink precipitate started to form. Rough Titration Titration 1 Titration 2 Titration 3 Initial Burette Reading + 0.05cm3 0.00cm3 18.80cm3 1.00cm3 18.40cm3 Final Burette Reading + 0.05cm3 18.80cm3 36.30cm3 18.40cm3 35.60cm3 Titre +0.1cm3 18.80cm3 17.50cm3 17.40cm3 17.20cm3 The average Titre = 17.50 + 17.40 + 17.20 = 17.36666...cm3 3 = 17.40 (4sf) ...read more.


Therefore 1 mole of KX = 1.035 . 8.70 x 10-3 = 118.9gmol-1 One mole of KX has an atomic mass of 118.9gmol-1. Atomic mass of one mole of KX = 118.9gmol-1 Atomic Mass of one mole of K = 39.10gmol-1 Therefore the atomic mass of one mole of X = 118.9 - 39.10 Atomic mass of X = 79.80gmol-1 Therefore X = Br The unknown potassium halide was Potassium Bromide. Percentage Uncertainty Percentage Uncertainty of Volumetric Flask = 0.3 . x 100 = 0.12% 250.0 Percentage Uncertainty of Pipette: 0.06 x 100 = 0.24% 25.0 Percentage Uncertainty of balance: 0.001 x 100 = 0.10% 1.035 Percentage Uncertainty of Burette: 0.1 x 100 = 0.57% 17.4 Overall Percentage Uncertainty of Equipment = 0.24 + 0.10 + 0.57 + 0.12 = 1.03% Effect of the total percentage uncertainty on the result [Atomic Mass KX = 118.9gmol-1] = 118.9 x 1.03 100 = 1.22gmol-1 (3sf) ...read more.


This may have resulted in the end point being overstepped, or not quite reached, which would have affected the accuracy of the results. Although there was a total percentage error on the equipment of 1.03%, this is negligible, as the greatest error on the results in this titration would be caused by personal judgement, as when the end point is judged to have occurred is dependent on the person carrying out the titration. The accuracy of the results obtained from this titration may be improved if the silver nitrate solution was held in a container that blocked out light. As a result of this, the silver nitrate would be less affected by the light, and consequently the end points of each titration would be more consistent, therefore improving the accuracy of the results. ?? ?? ?? ?? Emma Wellham 0502966 Titration of an Unknown Potassium Halide Against Silver Nitrate Page 1 of 3 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate 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 International Baccalaureate Chemistry essays

  1. Analysis of Silver in an Alloy

    * The beaker was then covered with plastic wrap to keep dust out of the solution and left to stand over night in a drying oven so that the precipitate particles could grow larger and filtered easier. Day 2 * A B�chner Funnel, a B�chner Flask with a filter paper,

  2. Using Solubility Rules to Indentify Unknown Solutions

    regarding the ionic solutions. - A prediction of the amount of precipitate formed by the unknown solutions will be made by using the concentration formulas outlined in the theory. This will involve using both formulas to eventually determine the theoretical value of precipitate formed by the reactions.

  1. IB questions and answers on Atomic Theory

    5.9% 6Li and 94.1% 7Li -1x = -0.059 x = 0.059 or 5.9% 6Li 13. State the name and the mass number of the isotope relative to which all atomic masses are measured. 12C 14. Write the symbol for the species with 17 protons, 19 neutrons, and 18 electrons. 15.

  2. Testing for halide ions. The objective of the experiment was: ...

    * Steps 1 and 2 were again repeated for one solution and then concentrated ammonia was added into it.

  1. Aim: To determine the concentration of chloride ions in sea water by titration ...

    Dilute sufficient seawater for all readings taken. Thus the same concentration of sea water would be used. Use the same (10.0�0.05)cm3 pipette to titrate diluted sea water into flask. Thus the volume of diluted sea water used for all titrations would be same. Type and concentration of indicator solution.

  2. Determining the position of unknown element X in the Reactivity Series

    Take a strip of Element X and cut it into 7 equal pieces 2. Pour 5ml of CuSO4 into a test tube 3. Put a thermometer into one test CuSO4 and measure the temperature 4. Now put a piece of Element X into the test tube and measure ?H 5.

  1. alkali titration

    * After adding around 20.4dm3 of oxalic acid solution, the pink solution turned completely clear. 3 * Two drops of phenolphthalein was added to the sodium hydroxide solution, turning the solution in the conical flask pink. * After adding about 20dm3 of oxalic acid solution, each drop began turning the pink solution slightly clear.

  2. Research into the production of Nitrate Fertillisers.

    A solution containing dissolved ammonium sulfate is often added to post-emergence herbicide sprays to improve their effectiveness at weed control. Most plants are able to utilize both ammonium and nitrate forms of N for growth. In warm soils, microbes will rapidly begin to convert ammonium to nitrate in the process of nitrification [2 NH4+ + 3O22NO3- + 2H2O + 4H+].

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