pH- Indicators

Indicators

• Phenolphthalein

• Methyl Red

• Bromothymol Blue

• Litmus Blue

• Methyl Orange

 

Problem Solutions

– Water

– Baking soda

– Caustic soda

– Soapy water

– Muriatic acid

– Vinegar

When acids combine with Methyl Red, they usually produce a red substance.

 

When bases combine with Bromothymol Blue, they usually produce a blue substance.

A pH indicator is a compound that changes color insolution over a narrow range of pH values. Basically it's an acid-base indicator. When you add a different indicator to the problem solutions, they change color and show different pH values.