Red Cabbage Indicator

 Aim: I want to find out how red cabbage can tell if a liquid is an acid or a base.

Research: 

Method:

Equipment:

• Red cabbage
• Beaker
• Cup
• 
  

Instruction:

1. Wash your hands.
2. Get your equipment.

Result:

Discussion:

What is an acid and base? The Arrhenius definition is the simplest, and states that acids are compounds that increase proton concentration in solution, while bases are compounds that increase hydroxide concentration in solution. Arrhenius acids will always contain hydrogen and Arrhenius bases will always contain hydroxide groups.

What do chemical indicators do? chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. The common application of indicators is the detection of end points of tit rations.