What is the pH of the solution after the addition of 19.9 mL of sodium hydroxide? Chemistry What is the pH of the solution after the addition of 19.9 mL of sodium hydroxide? a. 0.779 b. 0.827 c. 1.079 d. 2.124 e. 2.424 Answer: C Share this Share on FacebookTweet on TwitterPlus on Google+