In the above 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.
- E. There will not be a color change.
Explanation
Phenolphthalein indicator is colorless below a pH of 8.3 but is red to pink in basic solutions above this pH. In this NaOH solution, it will be red to pink.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
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.
Practise Experimental Techniques in Chemistry
79 free Experimental Techniques in Chemistry MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Experimental Techniques in Chemistry questions
If the flame used to heat a flask is an orange color and blackens the bottom of the flask, what correction should you make to solve this problem?
If the liquid being distilled contains dissolved magnesium chloride, where will it be found after distillation is completed?
In this laboratory setup for distillation, where does the vaporization take place?
If an HCl solution has a concentration of 0.1 M and it requires 30 mL to reach the end point, and during the titration, 15 mL of NaOH solution is used, what is the molarity of the NaOH solution?
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.
What is the correction to the atmospheric pressure due to the 40.8 mm height of the solution in the tube and above the level in the beaker?