Question 24
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 percentage of the seawater is this?
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 percentage of the seawater is this?
