Question

Suppose a student performed the titration, but the solution never turned pink. Check all the possible explanations. The student forgot to add phenolphthalein. The student added too much phenolphthalein. The student was not patient enough. The student used HCl as both the analyte and the titrant. The student used NaOH as both the analyte and the titrant.

Answer 1

Potential reasons for not observing a pink color change during a titration include the omission of phenolphthalein, using the same substance for both the analyte and titrant, or impatience with the process.

Step-by-step explanation:

If a student performed a titration and the solution never turned pink, a few explanations are possible:

• The student forgot to add phenolphthalein. Without the indicator, there would be no visible sign of the endpoint.
• Using HCl as both the analyte and the titrant or NaOH as both the analyte and the titrant means that there is no reaction to monitor since both solutions would be the same.
• The student being impatient might not wait long enough for the color to develop or did not add titrant slowly around the endpoint, but this usually leads to passing the endpoint rather than never seeing a color change.

The student adding too much phenolphthalein could result in a deeper initial color, but it should still change upon reaching the endpoint. So, this is less likely to be the reason for the lack of pink color change.

Answer 2

Suppose a student performed the titration, but the solution never turned pink. Check all the possible explanations.

✔ The student forgot to add phenolphthalein. or A.)

The student added too much phenolphthalein.

✔ The student was not patient enough. or C.)

✔ The student used HCl as both the analyte and the titrant. or D.)

The student used NaOH as both the analyte and the titrant.