Question

acidity changes after dry ice is added
time (sec) ph of solution a ph of solution b
0 11.0 8.5
1 10.8 8.0
2 10.2 7.2
3 9.6 6.5
4 9.0 5.8
what happens to the acidity of solutions a and b after dry ice is added?
○ the ph of solution a decreases, and the ph of solution b increases.
○ the ph of solution a increases, and the ph of solution b decreases.
○ the ph of solution a increases, and the ph of solution b increases.
○ the ph of solution a decreases, and the ph of solution b decreases.

Explanation:

1. pH and acidity have an inverse relationship: lower pH means higher acidity, higher pH means lower acidity.
2. From the table, Solution A's pH drops from 11.0 to 9.0 over time as dry ice is added, so its acidity increases (pH decreases).
3. Solution B's pH drops from 8.5 to 5.8 over time as dry ice is added, so its acidity also increases (pH decreases).

Answer:

The pH of solution A decreases, and the pH of solution B decreases.