minum,add60mlofdilutedhydrochloricacid(1in2),dis- solve by heating, cool, add water to make 1000 ml. pipet 10 ml of this solution, add 30 ml of water and 5 ml of acetic acid-ammonium acetate buŠer solution, ph 3.0, and adjust the ph to about 3 with ammonia ts added dropwise. ...