What substance could be used to test if a sample of petrol contains any water as an impurity?
To test if a sample of petrol contains any water as an impurity, you can use a simple technique called the Water Separation Test. The substance that can be used for this test is a specially formulated water finding paste.
Here's how you can perform the test:
1. Obtain a small sample of petrol in a clean, transparent container.
2. Take a small amount of the water finding paste on a clean stick or applicator.
3. Gently mix the paste with the petrol sample by stirring it using the stick or applicator.
4. Observe the mixture for any changes.
5. If the paste changes color or shows indications of water presence, it means that the petrol sample contains water as an impurity.
The water finding paste typically changes color when it comes into contact with water, which allows you to visually identify the presence of water in the petrol sample.
It's important to note that the water finding paste should be handled and used according to the manufacturer's instructions for accurate results.