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Introduction to Titration

Last updated 6 months ago
7 questions
A. Add a few drops of vinegar to a small cup, and a few drops of universal indicator.

B. In a separate cup add a few drops of baking soda solution, and a few drops of universal indicator.
1

What is the pH of the vinegar?

1

What is the pH of the baking soda?

C. Add 15 drops of vinegar to a small cup.

D. Add 3 drops of phenolphtalein to the cup.

E. Add drops of baking soda until you notice a color change in the cup that does not turn back to clear. Make sure you are swirling the cup, by holding the cup and swirling it. DO NOT TOUCH THE DROPPER TO THE LIQUID.
1

What happened to the pH of the solution from step C to step E?

1

Explain what happened to the H3O+ concentration from step C to step E.

1

Explain what happened to the OH- concentration from step C to step E.

F. Add drops of vinegar into the cup till you notice a change again. Continue to swirl. DO NOT TOUCH THE DROPPER TO THE LIQUID.
1

What happened as you added more vinegar? Explain in terms of the pH.

G. In a new cup, count 15 drops of vinegar and 2 drops of phenolphtalein. Count exactly how many drops it takes of baking soda solution for it to stay pink.
1

How many drops did it take?