In which solution is the [H3O+] less than 0.250 M? Chemistry Chapter 14 In which solution is the [H3O+] less than 0.250 M? A) 0.250 M HC2H3O2 (aq) B) 0.250 M HF (aq) C) 0.250 M HCO2 (aq) D) all of these E) none of these Answer: D Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+