In this activity: Students conduct a reaction with citric acid and baking soda in a universal indicator solution. The resulting chemical reaction produces a gas, causes a color change with an ...

1. Dissolve 6.5g KOH (potassium hydroxide) in 1600mL water and add several drops of universal indicator. Place in 2000mL graduated cylinder.

When pure water is dropped into a solution of universal indicator, the indicator stays green. This indicates a pH value of 7 and tells us that water is neither alkaline or acid, but neutral.

Add approximately 10 mL universal indicator and stir so that the water is visibly green. Then add 3-4 drops of 6M HCl and stir until the mixture becomes red. Add 4-6 sodium hydroxide pellets. As they ...