method 2 ( volume of hydrogen)

• measuring the volume of hydrogen produced in a reaction
• magnesium + hydrochloric acid $\rightarrow$ magnesium chloride + hydrogen
• 1. using a measuring cylinder measure 50cm $^3$ of hydrochloric acid in a conical flask
  2. attach a bung and delivery tube
  3. place the delivery tube in a container filled with water
  4. place a measuring cylinder overturned with water on top of the delievery tube
  5. add 3cm strip of magnesium to the hydrochloric acid and start a stopwatch
  6. every 10 seconds , measure the volume of hydrogen until the reaction is finished
  7. repeat the experiment using different concentrations of hydrochloric acid
• the two experiments show the experiment is reproducible and is proven by two different experiments