Rate experiments

• What is the first step in the magnesium and HCl reaction experiment?

  Add dilute hydrochloric acid to a flask
• What should be done after adding magnesium ribbon to the acid?

  Quickly attach a gas syringe to the flask
• What is the purpose of starting the stopwatch in the experiment?

  To measure the time for gas production
• How can you record the results of the magnesium and HCl reaction?

  By putting the results in a table
• What is the procedure to investigate the effect of acid concentration on the rate of reaction?

  • Use different concentrations of acid
  • Keep magnesium ribbon and acid volume constant
  • Plot results on the same graph
  • Compare how concentration affects reaction rate
• What does a higher concentration of acid do to the rate of reaction?

  It increases the rate of reaction
• What is the hypothesis for the sodium thiosulfate and HCl experiment?

  Higher acid concentration makes solution cloudy quicker
• What happens when sodium thiosulfate and HCl react?

  They form a yellow precipitate of sulfur
• How should the flask be positioned during the sodium thiosulfate experiment?

  On a paper with a black cross drawn
• What is the significance of the black cross in the sodium thiosulfate experiment?

  It helps observe the cloudiness over time
• What are the steps to investigate how acid concentration affects the rate of reaction with sodium thiosulfate?

  1. Use different concentrations of HCl
  2. Keep the depth of liquid constant
  3. Measure time for the mark to disappear
  4. Analyze results for reaction rate
• What is the relationship between HCl concentration and time taken for the mark to disappear?

  Higher concentration results in less time
• What does the data show about the effect of HCl concentration on reaction time?

  Increased concentration decreases reaction time
• What is a limitation of the sodium thiosulfate and HCl reaction experiment?

  It doesn't produce a set of graphs