Name the pieces of equipment shown in Figure 1.
Figure 1
You are required to prepare 250 cm3 of a 0.100 mol dm-3 solution of copper sulfate, CuSO4.
Calculate the mass of CuSO4 required to prepare 250 cm3 of a 0.100 mol dm-3 copper sulfate solution.
Distilled water is used to make up aqueous standard solutions.
Identify two pieces of equipment that should be rinsed with distilled water when making a standard solution.
A standard solution of 0.50 mol dm-3 sodium carbonate (Mr = 106 g mol-1) is made using the following method.
- Weigh out 50.3 g of sodium carbonate into a weighing boat.
- Transfer the sodium carbonate into a beaker.
- Rinse the weighing boat, with distilled water, into the beaker.
- Add approximately 50 cm3 of distilled water to the beaker.
- Stir the beaker.
- Transfer the solution from the beaker into a 1 dm3 volumetric flask.
- Rinse the beaker, with distilled water, into the volumetric flask.
- Add distilled water to the volumetric flask until the bottom of the meniscus is level with the graduation mark.
- Stopper the volumetric flask and invert.
- Remove the stopper and check the bottom of the meniscus is level with the graduation mark.
- If necessary, add distilled water to bring the bottom of the meniscus to the graduation mark.
Use the information in this question, to state the amount of sodium carbonate and distilled water required to make a 0.25 mol dm-3 sodium carbonate solution.
Did this page help you?