Question 5
Think like a scientist: Dissolving and mass
You will need: top pan balance; filter paper; salt; stirring rod; beaker of water.
Method
1 Place the filter paper on the top pan balance. Measure and record its mass.
2 Add about 20–25 g of salt. This is the solute. Measure and record the mass of the salt.
3 Remove the paper and salt from the balance.
4 Place a beaker containing at least 100 cm³ of water on the top pan balance. Measure and record the mass of the water and the beaker together. The water is the solvent.
5 Add the salt to the water. Stir until all the salt has dissolved. Measure the mass of the beaker and salt solution.
What was the mass of the water and the beaker?
You will need: top pan balance; filter paper; salt; stirring rod; beaker of water.
Method
1 Place the filter paper on the top pan balance. Measure and record its mass.
2 Add about 20–25 g of salt. This is the solute. Measure and record the mass of the salt.
3 Remove the paper and salt from the balance.
4 Place a beaker containing at least 100 cm³ of water on the top pan balance. Measure and record the mass of the water and the beaker together. The water is the solvent.
5 Add the salt to the water. Stir until all the salt has dissolved. Measure the mass of the beaker and salt solution.
What was the mass of the water and the beaker?
