Formaldejyde clock reaction 812.docx - Rate Law Experiment...

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Rate Law Experiment 812 Jack Nunnington Dr. Anquandah January 24, 2019
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Introduction: The objective of this experiment is to determine the rate law for a given chemical reaction using the method of initial rates. This reaction is a formaldehyde clock reaction similar to experiment 700. ¿ ( aq )+ OH ( aq ) 2 ¿ ( aq )+ CH 2 O ( aq )+ H 2 O ( l ) phenolphthalein CH 2 ( OH ) SO 3 ¿ SO 3 ¿ Procedure: Part One of the procedure is carry out the control experiment. Place 5.0ml of 0.012M formaldehyde and 5 drops of 0.1% phenolphthalein into a 50 ml beaker and mix. Next add 5.0 ml of 0.0685 M sulfate into the solution and begin timing simultaneously. Gently stir the solution while timing the colour change. Repeat this process 3 times keeping everything the same. . Calculate all concentrations and record in data table. Part Two will be varying the concentration of sulfite. Dilute 4 ml of sulfite with 1 ml of DI water. Then repeat Part One but this time using the new diluted concentration. Next dilute 2.5 ml of sulfite with 2.5 ml of DI water, repeating Part One with this concretion. Finally, Dilute 1 ml of sulfite with 4 ml of DI water, repeating Part One with this final concentration. Calculate all concentrations and record in data table. Part Three will be varying the concentration of formaldehyde. Start by diluting 5 ml of sulfite into 15 ml of water. This diluted sulfite solution will now be used for the rest of Part Three. Next, Dilute 4 ml of formaldehyde with 1 ml of DI water. Then repeat Part One but this time using the new diluted concentration of formaldehyde. Next dilute 2.5 ml of formaldehyde with 2.5 ml of DI water, repeating Part One with this concretion. Finally, Dilute 1 ml of formaldehyde with 4 ml of DI water, repeating Part One with this final concentration. Calculate all concentrations and record in data table.
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Results: Part One: Trail [ CH 2 O ¿ [ 2 ¿ SO 3 ¿ ] Time (seconds)
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  • Fall '19
  • DI, Rate equation

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