Tare accurately a 125-ml glass-stoppered conical flask containing 35.0 ml of
1N sulfuric acid. Cool the sample in the original bottle to 10o or lower. Partially
fill a 10-ml graduated pipet from near the bottom (do not use vacuum for
drawing up the sample). Wipe off any liquid adhering to the outside of the
pipet and discard the first ml. Hold the pipet just above the surface of the acid
and transfer 2 ml into the flask, leaving at least 1 ml in the pipet. Stopper the
flask, mix and weigh again to obtain the weight of the sample. Add methyl red
TS and titrate the excess acid with 1N sodium hydroxide. Subtract the excess
sulfuric acid from the total sulfuric acid (35.0 ml) to find the ml used to
neutralize the sample. Each ml of 1N sulfuric acid used to neutralize the
ammonia is equivalent to 17.03 mg of NH