Name two indicators and explain how are they used to test acids & bases.
Answers
Answer:
Acid-base indicators are chemicals used to determine whether an aqueous solution is acidic, neutral, or alkaline. Because acidity and alkalinity relate to pH, they may also be known as pH indicators.
Examples of acid-base indicators include litmus paper, phenolphthalein, and red cabbage juice.
An acid-base indicator is a weak acid or weak base that dissociates in water to yield the weak acid and its conjugate base or else the weak base and its conjugate acid. The species and its conjugate have different colors.
The point at which an indicator changes colors is different for each chemical. There is a pH range over which the indicator is useful. So, the indicator that might be good for one solution might be a poor choice to test another solution.
Some indicators can't actually identify acids or bases, but can only tell you the approximate pH of an acid or a base. For example, methyl orange only works at an acidic pH. It would be the same color above a certain pH (acidic) and also at neutral and alkaline values.
Explanation:
Turmeric Indicators and Litmus Indicators
Turmeric Indicator:-
When turmeric paste is added to the acidic solution, it remains unchanged. The color in the acidic solution is yellow. When turmeric paste is added to the basic solution the yellow color changes to red color due to the neutralization reaction...
Litmus Indicator
blue litmus paper turns red under acidic conditions, and red litmus paper turns blue under basic or alkaline conditions, with the color change...