Answer:
The correct statement is that the concentration of the acid in the solution will increase.
Step-by-step explanation:
On the basis of the given question, if one dissolves 10 milliliters of acid in a beaker of water, the acid will get diluted. As the number of moles of acid is not going to change, thus, one can use the formula:
M1V1 = M2V2
Here, M is the concentration of the acid in the solution,
V1 = 10 ml
V2 = V water + 10
If we supplement, an other 5 ml of acid, the new concentration of the acid will be:
M = M1 (5 ml) + M2 (Vwater + 10 ml) / (5 ml + V water + 10 ml)
Therefore, the concentration of the acid in the new solution will increase.