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

Experiment to investigate the effect of concentration of electrolyte on the current of voltaic cell

Extracts from this document...

Introduction

Experiment to investigate the effect of concentration of electrolyte on the current of voltaic cell Aim The aim is to identify the relationship between the concentration of H2SO4 solution and the current of Cu-Zn voltaic cell. Hypothesis My hypothesis is that the greater the concentration of sulfuric acid the bigger the current of the voltaic cell. In a voltaic cell, chemical energy is concerted to electrical though the oxidation and reduction happen on the electrodes. Current will not flow through pure water. There must be electrolytes dissolved in it before electricity can pass through it. When the concentration of sulfuric acid is increased, the number of ions is increased. There will be more ion carrying electric charge. Then, current is increased. Introduction and Background This is the Cu-Zn voltaic cell used in the experiment. Zinc has higher reactivity and it is more likely to loss electrons. Thus, electrons flow from Zn electrode to Cu electrode. Copper stripe is the positive electrode. Zinc stripe is the negative electrode. ...read more.

Middle

4. When you first out the electrodes in the electrolyte, the pointer of ammeter will wave violently. After some time, record the number ampere before the pointer start falling to the original point. 5. Repeat step 1 to 4 for tree time. 6. Repeat step 1 to 5 with more diluted sulfuric acid. Control the total 40mL volume of solution. Increase the volume of water and reduce the volume of original 9molL-1 H2SO4. Rough Collected Data Quantitative observations: Concentration of H2SO4 solution: 9molL-1 Volume of H2SO4: 40mL The solutions were supplied by the teacher with the given error of 1. A cylinder was used to deliver the solutions; hence the error was estimated at 0.2 cm3. Volume of H2SO4( Volume of H2O( Volume of diluted H2SO4 1 5 35 40 2 4 36 40 3 3 37 40 4 2 38 40 5 1 39 40 Concentration of diluted H2SO4(molL-1) 1 1.125 2 0.900 3 0.675 4 0.450 5 0.023 electronic current (A)(0.015A) Average electronic current (A)(0.015A) 1 0.21 0.22 0.22 0.217 2 0.18 0.18 0.18 0.180 3 0.14 0.15 0.14 0.143 4 0.12 0.12 0.12 0.120 5 0.11 0.09 0.11 0.103 Concentration of diluted H2SO4 Electronic Current (A)(0.015A) ...read more.

Conclusion

There are a number of changes which can help to improve my experiment and makes the results more reliable. For example, the ammeter I used in this experiment is not so accurate. A better machine with smaller uncertainty can make the results more reliable. When water and sulfuric acid solution are added together, heat is released. It may be better to measure the temperature of the mixed solution and waiting for the temperature to fall to the room temperature. Then the results will be more accurate. The copper and zinc stripes are not pure enough. Impurity in the stripes may consume some of the current of the voltaic cell. The result will be less than what it should be. Purer stripes can improve the experiment results. During the experiment, pungent smell is released. It is because that some acid mist came out with the hydrogen gas. There may be some toxic substance in the mist. To improve this situation, a porous board wetted by NaCO3 solution should be used to fix the electrodes instead of the cystosepiment. A porous board can let the hydrogen gas come out and basic NaCO3 solution in it can react with the acidic impurities in the gas and reduce the pungent smell. ...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. Design Lab-Voltaic Cell

    Repeat steps 3 & 4 9. Clean all equipment Trial 2: For this trial Zn and Sn metals will be used as electrodes. 1. Place the Zn electrode into the zinc solution and the Sn into the copper solution.

  2. Investigating the effect of ion concentration in electrolytes on the potential difference in a ...

    * Measuring cylinder - 25ml�0.3, x 2 Variables Independent * Electrolyte content * Electrolyte concentration Dependent * Voltage Controlled * Type of electrode * Volume of electrolyte Method 1. Connect the copper and iron electrode to the voltmeter by using the connecting wire.

  1. Investigating Solutions. In this experiment the effect of concentration of different solutions will be ...

    are able to travel towards the positive end of the gradient carrying a charge. Since the graph follows the pattern I believe in this conclusion quite strongly as many quotes from the internet and some books say: "The conductance of electrolytic solutions depends on the concentration of the ions and

  2. Electrochemical cells - investigate the effect of the temperature change of the anode electrolyte ...

    0.5M 50mlx3 Zinc sulphate (znso4) 0.5M 50mlx3 Mg strip 0.5cm x 5cm 3 Zn strip 2cmx5cm 3 Sand paper 1 Thermometers 1-100d 1 �0.001 Wires 2 KNO3 4M 30ml Filter paper 3cm wider 3 Hot plate 1 clamp 2 METHOD (Did you clearly describe the procedure to be followed?

  1. To Investigate the Effectiveness of Antacid products you can buy

    mol Amount of CaCO3 = 1.00 100.09 = 0.00999 mol So, Amount of MgCO3 and CaCO3 = 0.01186 + 0.00999 = 0.02185 mol So, Amount of hydrochloric acid neutralised by 1g of Rennie tablet = 4 x 0.02185 = 0.08740 mol The Gaviscon tablets contain the active ingredients sodium calcium carbonate and hydrogen carbonate.

  2. Aim To investigate the chemical properties of alcohol

    If methanol had been used instead of ethanol then the oxidation product would have been methanoic acid and the two step oxidation would occur as follows: H H -C - OH --> H - C = O --> H - C = O H H OH Here because the carbonyl

  1. Change of Potential Difference in Voltaic Cells Lab Report

    For 50ml of copper sulfate solution, divide the 1L mass by 20 = = 12.485g of CuSO4.5H2O Dissolve 12.485g of CuSO4.5H2O in 50 ml distilled water, using a volumetric flask. Use the formula: C1V1 = C2V2 to prepare different concentrations of copper sulfate from the stock solution of 1M concentration.

  2. How duration affects the rate of electrolysis in a Voltaic Cell

    The charge on the zinc ion should be 0 because Zn is being converted to Zn 2+ Concentration of electrolyte Controlled Use the same solution for all the trials. The solution primarily should be 1 mol dm-3 (just like standard conditions)

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