Define indicators. give one example
Answers
Indicators are substances that change colour when they are added to acidic or alkaline solutions. Litmus, phenolphthalein, and methyl orange are all indicators that are commonly used in the laboratory.
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Answer:
An indicator is a substance that changes its colour in acidic and basic medium.An indicator shows one colour in acidic medium and different colour in basic medium so that they are called indicators. eg:-Litmus , turmeric.
Explanation:
Characteristics of indicators:
Valid: accurate measure of a behaviour, practice, task that is the expected output or outcome of the intervention.
Reliable: consistently measurable over time, in the same way by different observers.
Precise: operationally defined in clear terms.
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