Question 27
Think like a scientist: Finding the mass of salts in seawater
You will need:
• evaporating basin • tongs • Bunsen burner • tripod • pipe-clay triangle
• safety glasses • top pan balance • seawater sample
Method
1 Read through the method and think very carefully about any risks there may be when you carry out this task. Write a risk assessment.
2 Place an evaporating basin on a top pan balance and record its mass.
3 Add some seawater and find the mass of the seawater.
4 Heat the seawater until it begins to spit. Remove from the heat and allow the rest of the water to evaporate.
5 When there is no longer any water remaining and the basin is cool, find the mass of the salts.
What difficulties did you have carrying out this investigation? How did you try to overcome them?
You will need:
• evaporating basin • tongs • Bunsen burner • tripod • pipe-clay triangle
• safety glasses • top pan balance • seawater sample
Method
1 Read through the method and think very carefully about any risks there may be when you carry out this task. Write a risk assessment.
2 Place an evaporating basin on a top pan balance and record its mass.
3 Add some seawater and find the mass of the seawater.
4 Heat the seawater until it begins to spit. Remove from the heat and allow the rest of the water to evaporate.
5 When there is no longer any water remaining and the basin is cool, find the mass of the salts.
What difficulties did you have carrying out this investigation? How did you try to overcome them?
