Please enable JavaScript.
Coggle requires JavaScript to display documents.
Test for cations, Tests for gases, Test for anions, Relevance in real life…
Test for cations
-
Tests using sodium hydroxide(Used to find out which cation it is by observing what precipitate is formed)
-
Tests for gases
-
oxygen O2
Light a splint, and put it in the gas you want to test e.g. carbon dioxide
If oxygen is present, the splint will relight, for instance if carbon dioxide was in the test tube, the splint would relight.
carbon dioxide CO2
Pour lime water (calcium hydroxide) into a test tube, and bubble the gas into the test tube.
If carbon dioxide is present, the mixture will turn cloudy, as a white precipitate would have been formed.
ammonia NH3
Insert damp red litmus paper into the gas. Be sure to not inhale the gas if it might contain chlorine, as it has a pungent smell that is dangerous.
If the colour of the litmus paper turns blue, then ammonia is present.
chlorine Cl2
Insert damp universal indicator / litmus paper into the gas. Be careful to not inhale the gas, as if it contains chlorine, it has a sharp, distinct smell that is dangerous.
If the colour of the UI / litmus paper turns into a bleached red, then chlorine is present.
Test for anions
-
Tests for halides using silver nitrate and nitric acid( Silver nitrate is insoluble in halides, so a precipitate will be formed.)
-
Relevance in real life
Cations and anions play very important roles in health and medicine. Ions such as sodium, potassium, calcium and more are needed to maintain proper hydration and blood pH, and they are needed for the proper function of nerve and muscle tissue. To be able to test for these ions would be crucial in maintaining proper hydration and blood pH