Respuesta :
Solutions that turn litness paper blue are classified as basic substances which are substances with a pH more than 7. You can make a substance such as water more basic by adding something such as baking soda
Using indicators at a certain point in each reaction the solution turned blue, indicating that a pH change had occurred due to increase in the hydroxide ion concentration.
What is an indicator?
Indicator is defined as a chemical substance which is chemically a weak acid or a weak base which changes it's color depending upon the concentration of hydrogen ions present in the solution.They dissociate slightly in water to produce ions.
These are generally derived from plant pigments and are of slightly acidic or basic in nature.There are three types of indicators:
1) natural indicators
2) synthetic indicators
3) olfactory indicators.
These are mainly used in determination of end point of titrations. Every indicator has it's pH range in which it can perform effectively.These are usually organic compounds.
Learn more about indicators,here:
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