Aim: To identify the limiting reagent in the reaction on the basis of practical and theoretical yield

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Practical Report- 7

Aim: To identify the limiting reagent in the reaction on the basis of practical and theoretical yield

Hypothesis: first three reactions in the experiment potassium iodide is the limiting reagent and in the fourth reaction the reaction is suppose to be complete reaction with no limiting reagent and in the rest of the reactions lead nitrate is the limiting reagent.

Requirements:

  • Potassium Iodide
  • Electronic balance±0.01
  • Lead Nitrate
  • Pipette±0.05
  • Round bottom flask
  • Conical flask
  • Glass funnel
  • Filter paper
  • Water

Method:

  • weight 20.75gms of potassium iodide on an electronic balance
  • put potassium iodide in a round bottom flask
  •  add 250 cm3 of water to the flask to make solution of 0.5 molar concentration potassium iodide
  • weight 16.6gms of lead nitrate on an electronic balance
  • put the lead nitrate in a round bottom flask
  • add 100 cm3 of water to the flask to make 0.5 molar concentration of lead nitrate
  • using a pipette take 10 cm3 of lead nitrate and place it in a conical flask
  • using a pipette take 5 cm3 of potassium iodide and place it in the conical flask containing 10 cm3 of lead nitrate
  • measure mass of the filter paper
  • fold a filter piece of filter paper and place it in a glass funnel
  • place the funnel on the top of another conical flask
  • shake the conical flask containing the mixture gently
  • pour the mixture in the funnel
  • add some hot water in the flask and add the solution the funnel as well
  • wait for the mixture to filtrate and dry
  • measure mass of the dried filtrate
  • deduce the mass of filter paper from the result
  • calculate the theoretical yield of the reaction
  • compare the difference between the theoretical and practical yield
  • repeat the experiment using different volumes of potassium iodide while keeping the amount of lead nitrate same
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Precautious:

  • do not over flow the filter paper in the filtrating funnel
  • do all the reactions at same temperature
  • make sure all the apparatus is clean and no salt is present from before
  • make sure all the apparatus is dry so that concentration of the solution is not affected

Results:

Calculations:

Mass of the potassium iodide= mass of one mole x no of moles

No of moles=concentration x volume

No of moles = 0.25 x 0.5

No of moles=0.125

Mass= 0.125 x 166

Mass= 20.75gms

Precautions: ...

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