The end point of an being used This could be a color change

The end point of an being used. This could be a color change or a dramatic change in pH on a pH meter. The equivalence point of the ttration occurs when he color of the solution or and the t

Solution

Ans. Given, 50.0 mL of 0.100 M is being titrated with standard 0.100 M NaOH solution.

Titration can be in either way (acid can be taken in flask and base in burette- or, vice-versa). However, as mentioned in option IV, base is added to the acid- so, base is taken in the burette and acid in flask.

# Option I. Correct. Titration of an acid with a base is an acid-base neutralization reaction.

# Option II. Incorrect. At the beginning, the pH of solution (as indicated by the transient color appearance of the indicator upon addition of base dropwise) slowly because the base is rapidly neutralized by acid.

# Option III. Incorrect. Note that a strong acid (HCl) is being titrated with a strong base (NaOH). The titration of strong acid with strong base gives endpoint at pH 7.0. And the color turns to pink after endpoint.

# Option IV. Incorrect. Since HCl is taken in the flask (and standard NaOH in burette), the initial pH of HCl solution must be acidic, around 1.0 (pH = -log [H₃O⁺] = -log 0.1 = 1.0).

# Option V. Incorrect. The pH of solution changes rapidly at the equivalence point.

# Option VI. Correct. Note that a strong acid (HCl) is being titrated with a strong base (NaOH). The titration of strong acid with strong base gives endpoint at pH 7.0.

# So, correct options are - I, VI