Answer the following questions on the basis of the given table.
Sample Blue Red Methyl Phenolphthalein
solution Litmus Litmus Orange solution
H.SO. Red No change Red Colourless
KOH No change Blue Yellow Pink
CH3COOH Red No change Red Colourless
NH4OH No change Blue Yellow Pink
a) Which solutions do we observe with similar changes with red litmus and
phenolphthalein tests?
b) What is the effect of methyl orange solution on acids?
c) What do you infer from the above table ?
d) Divide the sample as acidic and basic in nature as per the above observations.
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Answer:
Phenolphthalein is a chemical compound with the formula C₂₀H₁₄O₄ and is often written as "HIn" or "phph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. Wikipedia
Formula: C₂₀H₁₄O₄
Molar mass: 318.32 g/mol
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