Althea Concha

  1. Weigh a 4cm strip of magnesium ribbon on the balance then roll the strip into a loose ball and tie a thread around and through it.
  2. Fill a 600ml beaker with two thirds full of tap water (400ml).
  3. Pour 15ml of a 6mol/L HCL acid solution in a gas measure tube.
  4. Fill the rest of the tube with distilled water.
  5. Submerge the magnesium to a depth of 5cm in the tube and insert the one holed stopper to hold the thread in place.
  6. making sure no air is trapped under the stopper. Holding the hole with your thumb, invert the tube and put the opening under water in the beaker. Remove your thumb and clamp the tube upright.
  7. After the reaction, cover the hole with your thumb and transfer it to the large jar of water in the lab while keeping the stopper end down.
  8. Move the gas tube up or down to match the level of water in the tube with the water outside the tube. The pressure inside the tube should be equal to the position outside the tube.
  9. Read the volume of gas in the tube
  10. Record the temperature of the water bath.
  11. Calculate the pressure of H2

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