Njoki was given a colourless liquid suspected to be water a) Describe one chemical test she could use to identity the liquid ?? b) describe an experiment she could perform to ascertain it's purity?

a) One chemical test Njoki could use to identify the liquid is the pH test. She could use pH paper or a pH meter to determine the acidity or alkalinity of the liquid. Water typically has a neutral pH of 7, so if the liquid she was given has a pH close to 7, it is likely water.

b) To ascertain the purity of the liquid, Njoki could perform a distillation experiment. She could set up a distillation apparatus and heat the liquid to its boiling point. The pure substance (water) will evaporate and condense back into a separate container, leaving behind any impurities in the original container. Njoki could then compare the purity of the distilled liquid to the known properties of pure water to confirm its identity.

a) Chemical Test to Identify the Liquid

- Add anhydrous copper(II) sulfate powder to the liquid:
- If the liquid turns blue, it indicates the presence of water. This is because anhydrous copper(II) sulfate has a white color and absorbs water to form a blue hydrated salt.

b) Experiment to Ascertain Purity

- Evaporation Test:

Materials:
- Petridish
- Funnel
- Filter paper
- Liquid sample

Procedure:
1. Filter the liquid sample into a petri dish to remove any impurities.
2. Use a dropper to carefully place a small drop of the filtered liquid onto a funnel lined with filter paper.
3. Allow the drop to evaporate completely at room temperature.
4. Examine the filter paper under a microscope.

Observations:
- If the filter paper remains completely clean after evaporation, it indicates the liquid is pure.
- If any residue or crystals are present, it suggests the presence of impurities.