Chemistry pH Levels Quiz

Study Notes

Four substances (A, B, C, D) were tested to determine the pH of an unknown substance.
Substance A has a neutral pH of 7.
Substance B is slightly acidic with a pH of 5.5 and is 100 times more acidic than substance A.
Substance C is basic with a pH of 10.5 and is 100,000 times more acidic than substance B.
Substance D is highly basic with a pH of 12.5.
The unknown substance is 100 times more basic than substance C, indicating it has a pH above 12.5.
Based on the pH scale, the unknown substance is classified as weakly alkaline.

Indicator A shows a color change from yellow in acidic conditions (pH 2-5) to green (neutral at pH 6-7), and turns blue in more basic conditions (pH 10-12).
Two indicators are referenced: Indicator A and Indicator B.
Solution 1 is neutral according to Indicator A (green) but acidic according to Indicator B (red).
Solution 2 is slightly acidic as demonstrated by Indicator A (yellow) and a neutral pink with Indicator B (rose).
Solutions 3 and 4 show green and blue responses, indicating they are neutral or basic, respectively.
Solution 2 is confirmed as slightly acidic based on the indicators used in the tests.