pratical 7

• 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.