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

How Changing Molarities Effect Percentage Yield

Extracts from this document...

Introduction

Design Lab Report Question How will varying the molarity of excess HCl to 1.0M, 2.0M and 3.0M affect the percentage yield of CO2 in the following reaction: CaCO3+ 2HCl� CaCl2+ CO2+ H2O Materials and Apparatus 150mL of 1.0M Hydrochloric acid, 75mL of 2.0 Hydrochloric acid, 50mL of 3.0M Hydrochloric acid, Calcium carbonate, 3 250mL beakers, 1 250mL graduated cylinder, 3 stirring rods, masking tape, balance. Variables Independent: Concentrations of HCl Dependent:The percentage yield of CO2 Controlled: Mass of CaCO3, size of beakers, balance Controlling Variables Mass of CaCO3: 3.0g will be used in each trial Size of beakers: the same beaker will be used in most of the trials Balance: the same balance is used in all trials Procedure: See attached sheet. ...read more.

Middle

The theoretical yield of Carbon dioxide in the reaction is as follows: Using this value I shall calculate the percentage yield in each of the above trials. Sample Calculation: Percentage yield of Carbon dioxide Table 4: Yield and Percentage Yield of CO2 in 3.0M HCl Trials Yield of CO2 (g) Percentage Yield of CO2 1 1.46�0.01 44.2%�0.7% 2 1.57�0.01 47.6%�0.6% 3 1.56�0.01 47.3%�0.6% Table 5: Yield and Percentage Yield of CO2 in 2.0M HCl Trials Yield of CO2 (g) Percentage Yield of CO2 1 1.49�0.01 45.2%�0.7% 2 1.60�0.01 48.5%�0.6% 3 1.63�0.01 49.3%�0.6% Table 6: Yield and Percentage Yield of CO2 in 1.0M HCl Trials Yield of CO2 (g) Percentage Yield of CO2 1 1.50�0.01 45.5�0.7% 2 1.60�0.01 48.5%�0.6% 3 1.73�0.01 52.4%�0.6% Conclusion and Evaluation When examining the Percentage yield value in the 2nd rows of Tables 4-6, the values are 44.2%�0.7%, 45.2%�0.7%, and 45.5�0.7% respectively. ...read more.

Conclusion

To improve this I will calculate the percentage yield of CaCl2 instead of CO2. Other aspects to take note of in the experiment include: making sure the amount of CaCO3 is precisely 3.0g, making sure to use the same stirring rod for each beaker, and being more precise in measuring out HCl. Modified Procedure: 1. "Mark each of the 3 beakers with '2.0M', '1.0M' and '0.5M' respectively"�"Mark each of the 3 beakers with '3.0M', '2.0M' and '1.0M' respectively" 3. � "Measure out 3 beakers of 50mL of HCl, add 25mL of water into the 2.0M beaker, and 100mL of water into the 1.0M beaker to dilute the acid" 4. �"Place 3.0g of Calcium carbonate in each of the 3 beakers, agitate the mixture with a stirring rod until bubbles do not form anymore" 7. Repeat steps 1-6. ...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. Genetically Modified Food

    But not test is successful; some GM crops proven unsafe and banned in some countries.

  2. FInding the percentage purity of CACO3 in egg shell

    This is the major variable , as according ti this variable all other variable are dependent of this.If we take a higher mass of egg shell then a greater concentration of acid will be required containing greater number of moles and greater concentration of NaOH will be needed.

  1. Determining the Percentage Yield of Sodium Chloride produced from Sodium Bicarbonate and Hydrochloric ...

    Trials 1 (g) 2 (g) 3 (g) Mass empty test tube 31.0658 31.2024 31.1766 Mass test tube and NaHCO3 31.2739 31.4126 31.2946 Mass NaHCO3 0.2081 0.2102 0.1180 Mass NaCl and test tube 31.2069 31.3442 31.2480 Mass NaCl 0.1411 0.1418 0.0714 Expected Mass NaCl 0.1448 0.1462 0.0821 Data Collection: Calculations: Molar mass for NaHCO3:

  2. Biodiesel Investigation - How the concentration of Potassium Hydroxide solution would affect the yield ...

    The centrifugation process will separate the biodiesel and glycerol. Extract the thin biodiesel layer (on top), measure the mass of the biodiesel in the initial beaker and derive the percentage yield of biodiesel from the mass difference between the solutions, density from mass and volume and make observations on the mass obtained.

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