In the titration setup, if you introduce 15 mL of the NaOH with an unknown molarity into the flask and then add 5 drops of phenolphthalein indicator, what will you observe?
Correct answer: A. A pinkish color will appear throughout the solution.
- A. A pinkish color will appear throughout the solution.
- B. A blue color will appear throughout the solution.
- C. There will be a temporary pinkish color that will dissipate.
- D. There will be a temporary blue color that will dissipate.
Explanation
Sodium hydroxide (NaOH) is a strong base. Phenolphthalein. indicator is colorless in acidic/neutral solutions but turns a distinct pink color in basic solutions (pH > 8.2). Therefore, adding it to NaOH will result in a pink solution.
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About Experimental Techniques in Chemistry
Separation methods are selected according to differences in solubility, particle size, volatility and sublimation behaviour. Filtration and crystallisation separate insoluble or dissolved solids, sublimation isolates suitable volatile solids, distillation separates liquids by boiling point, and solvent extraction transfers a substance between immiscible solvents.
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