Dilute sulfuric acid can be used to prepare both soluble and insoluble salts.
A student wants to obtain a pure, dry sample of the soluble salt, sodium sulfate, from dilute sulfuric acid.
(i) The student carries out a titration to find the precise volume of dilute sulfuric acid needed to react completely with a fixed volume of sodium hydroxide solution.
Describe the experimental steps she should take to perform this titration. Refer to the following apparatus in your response:
- pipette
- burette
- conical flask
The diagram shows the burette readings before and after adding the acid in one of the titrations.
Use these readings to complete the table, giving all values to the nearest 0.05 cm30.05\text{ cm}^30.05 cm3.
| Observation | Volume (cm3\text{cm}^3cm3) |
|---|---|
| burette reading after adding solution | |
| burette reading before adding solution | |
| volume of solution added |
The student plans a different experiment to obtain a pure, dry sample of the insoluble salt, barium sulfate, from dilute sulfuric acid.
Describe the steps she should take to prepare this dry sample of barium sulfate.