A 25ml sample of 0.400mNH3 is titrations with 0.4M HCL. What is the ph at the equivalence point? Chemistry A 25ml sample of 0.400mNH3 is titrations with 0.4M HCL. What is the ph at the equivalence point? Answer: 4.97 Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+