rate experiments

• magnesium and HCL reaction to produce hydrogen
• what is the practical for reacting magnesium and HCL to form a gas?

  1. add hydrochloric acid to a conical flask
  2. add some magnesium to the acid and attach a gas syringe to the flask
  3. start the stopwatch and take readings of the volume of gas at regular intervals
  4. plot results on a table and form a graph
• what is the practical for sodium thiosulfate and HCL to produce a cloudy precipitate?

  1. add dilute sodium thiosulfate to a conical flask
  2. add a mark with a black pen to the bottom of the flask
  3. add some dilute HCL to the flask and start the stopwatch
  4. time how long it takes for the black cross to disappear
• to investigate how concentration affects repeat the practical to form a cloudy precipitate using different concentrations and record your results
• what is the equation to work out the mean rate of reaction?

  change in y / change in x
• draw a tangent to find the rate of reaction at a particular point
• how do you draw a tangent?

  draw a straight line at the point of the curve the question has asked for and then pick 2 points that are easy to read to create a right angled triangle. use to find the graident which is change in y / change in x