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

Determining unknown solutions. Questions: Are there any silver, strontium, and/or zinc ions in the number 3 unknown solution

Extracts from this document...

Introduction

Purpose: This experiment is being performed because it shows how ions react together in a solution. We can learn how solubility works and determine the identity of an unknown solution. Questions: Are there any silver, strontium, and/or zinc ions in the number 3 unknown solution. Material Apparatus A beaker of number 3 unknown solution Filter paper NaCl solution 3 test tubes NaOH solution Dropper Na2SO4 solution Funnel Test tube rack Introduction: Some chemical substances have high solubility; those chemical substances can dissolve in water. Some chemical substances have very low solubility, if you put those chemical in water, it will product precipitate. On the basis of solubility, we can determine what chemical ions solution has. ...read more.

Middle

It means there is Sr2+ in the solution. Procedure: 1. Put 3 test tubes in test tube rack. Mark #1, #2 and #3 test tubes. 2. Use the dropper put some #3 unknown solutions into #1 test tube. 3. Use the dropper put excess sodium chloride solution into the #1 test tube. Shake the #1 test tube, wait a moment. 4. If there are some precipitate in the #1 test tube, use filter paper and funnel to filter precipitate out. Put filtrate into #2 test tube. Put excess sodium hydroxide solution into #2 test tube. Shake it, wait a minute. 5. If there are some precipitate, use filter paper and funnel to filter precipitate out. Put filtrate into #3 test tube. Put excess sodium sulfurate (Na2SO4) into #2 test tube. Wait a minute, see what happen. ...read more.

Conclusion

Mg2+ and Ca2+ could react with NaOH solution and Na2SO4 solution that we put into the test tubes. * Are there any major flaws in the lab design or procedure? We use the same dropper that contains 3 kinds of solutions, they could make another reaction. * Were the material and/or apparatus adequate to provide reliable results? No, we just know there are precipitate or not, but we don't know what the precipitate is, so I think we need other material to provide what the precipitate. * Are there any suggestions that could be made to improve the procedure, material or apparatus that would help to improve the procedure? We should use the 3 different droppers to put the 3 kinds of solutions into test tubes. We should use distilled water to wash the dropper and test tubes. ?? ?? ?? ?? ...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. Marked by a teacher

    Identifying an Ionic Compound. Objectives: To learn and test for metal ions ...

    5 star(s)

    Equation of the reaction: 2 HCl(aq) + Na2CO3(s) --> 2 NaCl(aq) + H2O(l) + CO2(g) Ionic equation: 2 H+(aq) + CO32-(aq) --> H2O(l) + CO2(g) Part 2- Tests to Identify Metal Ions: 0. Test for Cu2+, Fe2+, Fe3+ 0. Find the Cu2+ solution 0. Using a dropper add 3cm3 �0.05 of 0.1 mol/dm3 NaOH 0.

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

    The large measuring cylinder is useful for measuring the volume of larger amounts of liquids. However, this comes with less accuracy, since the readings are closer than they would be in a smaller measuring cylinder. 6. The evaporating basin should be clear of any liquid from previous experiments by

  1. 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.

  2. An Investigation Into How the Mass of Zinc Effects the Heat Change In the ...

    Therefore even though it is not a great distance away from the line of best fit, compared to the other results, this result is anomalous. Generally my results appear to be accurate, as the majority of the results are very close to the line of best fit, however, minor errors

  1. Rate of reaction of different concentrations of sodium thiosulphate.

    area if spillage has occurred with a dry cloth, * Work at a steady pace to avoid accidents. The Method of the experiment; Step 1- Measure 50cm3 (depends what stage) of sodium thiosulphate into a measuring cylinder of 100 cm3 make sure the meniscus level is correct to 50cm3 of

  2. GCSE Chemistry - Obtaining Zinc Oxide from Calamine

    10.00 6.49 Here is a graph of this data is below and it shows the theoretical values of zinc oxide obtained from calamine. Hypotheses: From the equation I have found out that for every 1 gram that I heat I will get 0.65 g of calamine thus for 2 I

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