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

Finding the percentage of Nickel in an unknown compound.

Extracts from this document...

Introduction

Finding the percentage of Nickel in an unknown compound. LAB 3 I. Purpose: Finding the percentage of Nickel in an unknown compound. II. Objectives: To separate and weigh nickel from a sample that contains an unknown amount of nickel and to use the mole method to determine the amount of nickel in the unknown sample. III. Background: Analytical chemistry can be simply divided into two areas. Qualitative analysis and quantitative analysis. The two words "qualitative", means to find out if a specific substance is present in a soil sample, and "quantitative" means to determine how much of that substance is in the sample. The analytical chemist has many tools at his disposal, for this quantitative experiment we will be performing a gravimetric analysis to find our how much nickel is in an unknown sample. Gravimetric analysis means to separate the nickel from the sample, and then weigh it. Your instructor will give you a test tube that contains approximately one gram of a compound that contains an unknown amount of nickel compound. You will dissolve a portion of this sample in water. ...read more.

Middle

Avoid direct contact with nickel compounds by using plastic gloves. VI. Experimental Procedures: 1. Find the mass of the unknown sample. Prepare your sample. Carefully weigh about 2.0 grams of your unknown nickel compound into a small beaker. Be precise. 2. Dissolve your sample in distilled water. Dissolve the sample in 20-30 mL of distilled water. You may need to heat your beaker slightly in order to dissolve the entire sample. Be careful not to spill any of your samples. 3. Use a clean beaker to get about 25 mL of DMG solution. 4. Add NH4OH and DMG. The nickel/DMG reaction proceeds more quickly and completely if you add a small amount of NH4OH (4-5 drops) to your dissolve nickel solution before you add the DMG. Bring your beaker of dissolved nickel to the lab fume hood and add the NH4OH. The NH4OH is very concentrated so do not spill any on yourself and do not inhale any vapors. 5. Bring the beaker containing the nickel solution and NH4OH back to your lab bench and carefully add the DMG solution a few drops at a time. ...read more.

Conclusion

Add DMG to the liquid in your vacuum flask to see if more NiDMG precipitates out. Re-filter if necessary. 8. Dry with acetone. By now you should have a wet mass of NiDMG sitting on your filter paper. In order to obtain an accurate mass measurement, you must completely dry the NiDMG. Acetone will remove water from the NiDMG, but will not dissolve the NiDMG. Acetone also evaporates very quickly. Turn the vacuum aspirator on and use an eye dropper to add about 25 mL of acetone to the NiDMG on your filter paper; then let the NiDMG dry for five to ten minutes with the aspirator on. The precipitate will turn light pink as it dries. 9. Determine the mass of the precipitate on your filter paper. Weigh your filter, funnel, and precipitate. Subtract the weight of the top of the funnel and filter, and you willl have the weight of the NiDMG you have recovered. 10. Repeat the entire experiment two more times to show that yur results are reproducible. Clean up. By the time you perform this experiment 3 times, you will have flasks and beakers encrusted with sticky, pink, solid NiDMG. Take time to completely clean your glassware and filtering apparatus before you leave the lab. ...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)

    using 2cm3�0.05 0.1 mol/dm3 NaOH and heat, then the litmus paper would turn the color green. This is precisely what occurred as there was an alkaline solution and the pH was green showing a basic solution. In my last hypothesis for part 1 of the experiment I had said that

  2. Marked by a teacher

    In this CDA I will write about how plastic bags are made, why plastic ...

    When the plastic bags are in the sea. Many animals suffocate and die, as they mistake the plastic bags for food. Plastic bags are also a non renewable source, as the plastic comes from crude oil. Crude oil is running out and it would take millions of years to get

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

    Temporary hardness removal: Permanent hardness removal: In each case magnesium or calcium is precipitated and this removes the hardness of the water. Soft water doesn't contain as many minerals as hard water. Also, unlike hard water, soft water doesn't cause limescale to build up in appliances since it doesn't have calcium carbonate dissolved into it.

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

    Then a lit splint was took and placed over the pipe of the Bunsen burner at arms length at the Bunsen burn ignited. Prior to lighting of the Bunsen burner the air whole at the bottoms was closed which meant when I lit the Bunsen burner the safety flame would appear.

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

    melting point of each solid, replacing each boiling tube after their contents have melted until melting points for all four test-tubes have been obtained * Make notes on any additional observations 1Paraffin oil heats more slowly and consistently allowing for a more gradual and measurable increase in temperature 2Only four

  2. Identification of an unknown compound.

    If the unknown chemical is either an aldehyde or a ketone, an orange/yellow precipitate will form. If a positive result occurs and an orange/yellow precipitate forms, proceed to test 3 (silver-mirror test), to distinguish between aldehydes and ketones. If no orange/yellow precipitate forms skip test 3 and continue to test 4.

  1. Antimatter and matter

    years, which is equivalent to 1500 lifetimes, if you lived to the average life expectancy of 65-70 years old. 5. A plaque commemorating Dirac and his equation is in Westminster Abbey.

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

    only to constantly develop their supply chain, but also simultaneously develop their product structure and their manufacturing process. In this paper we explore ways in which a company can create competitive advantage in a mature industry through a Build to Order Supply Chain.

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