Answer to Question #117664 in General Chemistry for Lia

Question

Titration Gizmo Self-assessment Multiple Choice Question: If you consider both indicators (phenolphthalien and bromothymol blue), what do you know about the total pH change caused by adding the last 0.1 mL of HNO₃?

Phenophthalien - before last drop was pink and had a pH above 8.2, after last drop turned colourless and had a pH below 8.2

Bromothymol Blue - before last drop was blue and had a pH above 7.6, after last drop turned yellow and had a pH below 6


Options:

1) last drop of HNO₃ caused pH to change from above 8.2 to below 6.0

2) last drop of HNO₃ caused pH to change from below 6.0 to above 8.2

3) last drop of HNO₃ caused pH to change from above 7.6 to below 6.0

4) last drop of HNO₃ caused pH to change from below 6.0 to above 7.6

Answer 1

The answer to your question is provided in the image: