Identifying the Unknown Liquid

Imagine a science lab at a school. On the table there is a small bottle of clear liquid, and nobody knows what it is. How can the students find out? A simple experiment is carried out, step by step, to identify the unknown substance.

First, the liquid is observed carefully. Is it clear or coloured? Does it have a smell? These first notes are written down before anything else is done. Nothing is tasted — in a science lab, a chemical is never put in the mouth.

Then, the liquid is measured. A small amount is poured into a clean glass and weighed. The temperature at which it boils is also recorded, because different substances boil at different temperatures. Water, for example, boils at one hundred degrees.

Next, simple tests are done. A strip of special paper is dipped into the liquid to see if it is an acid. The way the substance reacts gives more clues. Each result is compared with a list of known chemicals.

Finally, all the scientific notes are read together. The colour, the smell, the boiling temperature, and the paper test point to one answer. The mystery liquid is identified — and, more importantly, the students have learned how careful, ordered observation turns a question into a fact.