When is the end point reached and the volume of the HCl recorded in this reaction? I. When the color first disappears and returns in the flask. II. When equal amounts of HCl and NaOH are in the flask. III. When the color disappears and does not return in the flask.
Correct answer: B. III only
- A. I only
- B. III only
- C. I and III
- D. II and III
- E. I, II, and III
Explanation
The end point is reached when the color of the indicator disappears and does not return. The color will first disappear temporarily before the end point but finally will not return.
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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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