Outline 3 key steps in preparing a standard solution of sodium carbonate and state one precaution. Identify the main apparatus used.

Here are the answers to your questions:

a) (i) Outline 3 key steps in preparing the standard solution.

1. Accurately weigh the calculated mass of solid $\text{Na}_2\text{CO}_3$.
2. Dissolve the solid in a beaker using a small amount of distilled water.
3. Transfer the solution to a volumetric flask and make up to the mark with distilled water, then mix thoroughly.

a) (ii) State one precaution in preparing the standard solution.
Ensure the bottom of the meniscus is exactly on the calibration mark of the volumetric flask when adding distilled water.

b) (i) Identify the main apparatus in which you would prepare the standard solution.
Volumetric flask

**b)