pratical 7

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Created by
Lily P

Cards (13)

  • Pour some sodium hydroxide solution into the first conical flask, which is connected to the inlet pipe that allows the inflow of air, and remove carbon dioxide from the air.
  • Pour some hydrogencarbonate indicator into the second conical flask, which is connected to the first conical flask with a delivery tube.
  • Pour some sodium hydroxide solution into the first conical flask, which is connected to the inlet pipe that allows the inflow of air, and remove carbon dioxide from the air.
  • Place the respiring seeds in the third conical flask on some moist cotton wool, which is connected to the second conical flask.
  • Pour some hydrogencarbonate indicator into the second conical flask, which is connected to the first conical flask with a delivery tube.
  • Pour some hydrogencarbonate indicator into the fourth conical flask, which is connected to the third conical flask and also the outlet pipe that allows the outflow of air.
  • Place the respiring seeds in the third conical flask on some moist cotton wool, which is connected to the second conical flask.
  • Note the colour of the hydrogencarbonate indicator in flask 2 and 4 after some time, such as 30 minutes.
  • Pour some hydrogencarbonate indicator into the fourth conical flask, which is connected to the third conical flask and also the outlet pipe that allows the outflow of air.
  • Note the colour of the hydrogencarbonate indicator in flask 2 and 4 after some time, such as 30 minutes.
  • Compare the colour of the hydrogencarbonate indicator in flask 2 and 4 to a colour standard to find the carbon dioxide content of the 1) the air supplied to the respiring seeds and 2) the air released after being used by the respiring seeds.
  • Compare the colour of the hydrogencarbonate indicator in flask 2 and 4 to a colour standard to find the carbon dioxide content of the 1) the air supplied to the respiring seeds and 2) the air released after being used by the respiring seeds.
  • heat
    1. Set up 2 thermoflasks.
    2. Place respiring seeds with moist cotton wool in one thermoflask.
    3. Placed boiled seeds with moist cotton wool in the other to act as a control.
    4. Use a thermometer to measure and record the initial temperature.
    5. After a fixed number of days, measure and record the final temperature. Calculate thetemperature difference.