Answer:
5.4 mL of acid need to be added to 14.6 mL of water.
Explanation:
We can calculate how many mL of acid are needed by using the C₁V₁=C₂V₂ formula:
Then we calculate how many mL of water have to be added in order to reach 20.0 mL:
Thus, 5.4 mL of acid need to be added to 14.6 mL of water.