Question 3
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.
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.
