Question

Part C: Neutralization Reactions

In a clean, small container (glass vial or small paper cup), place about ten drops of an ammonia cleaner and two “squirts” of cabbage juice indicator.

Use a clean medicine dropper and count the number of drops of vinegar required to change the color of the solution from green to purple.

Repeat the above tasks with pickle juice or some solution that you found to have an acid pH slightly higher than vinegar.

Create a data table that summarizes your results of the two titrations.

Part C Table

Neutralization Reactions – comparison of two acid solutions neutralizing a base cabbage juice + ammonia solution

Insert Table Here

Drops of vinegar	Ammonia	Pickle juice
First	6	8
Second	8	8
Third	7	9

In the titration of ammonia solution with vinegar, and with another acid solution with a slightly higher pH value, how did the amounts needed for the neutralization of the ammonia (signaled by the change from green to purple in the solution containing the ammonia and cabbage juice) compare? How does this comparison match the differences in pH values? What is the basis of any correlation between starting pH values of the two acids and amount required to neutralize the same amount of vinegar solution? Provide explanations for each for the three questions.

Answer 1

1. Comparision can be done by using noting the number of drops of added Ammonia solution to each of the Acid solutions (Vinegar and Pickle Juice).

For say if Vinegar required 6 - drops Ammonia is required for neutralization and Pickle Juice required 8 - drops of Ammonia for neutrlization. Thatmeans pickle has required more amount of Ammonia for neutrlization, so it should be stronger acid than vinegar.

2. This comparision can be matched to change in pH because there is an indicator which is useful to differentiate the changes in pH values.

3. In presence of an indicator: Shows one type of colour upto certain pH range of values but when it (solution mixture) crosses that pH range due to the addition of base (ammonia) then indicator starts change its colour. So, indicator is useful to identify change in pH.