What indicators are, why they are useful and why each is good at doing a particular thing
Indicators are very important in the chemistry laboratory! While universal indicator is useful to determine the exact pH of substance, other indicators, that have a single colour change are used to determine a reactions end-point or if something has gone beyond a specific pH.
It is for this that:
--> Universal indicator is NOT the most useful indicator
-->Different indicators are useful for different types of reaction
--> Liquid, indicators can change the pH they are testing!
--> Liquid indicators cannot be used to test the pH of reactions already involving strong colours
--> Sometimes an electric pH meter is more useful than an indicator
--> An indicator may not be needed to determine the reaction end-point!
Acids & Bases
What acids and bases are and how they react with each other
Salts are made when a metal and a non-metal bond together in an ionic bond
See the worksheet below for easy instructions on how to name salts
Salts have many uses in industry - they are also used to give fireworks their beautiful colours.
Each salt burns a bright and unique colour, see the video to the right where balloons with different salts inside are burst to show the flame colour of the salt.
Examples of the salts made in acid-base reactions are shown below. Take care not to forget that all of these reactions make other products too!