Ammonium bicarbonate ammonia in the determination of nitrogen-acid volume method
A,experimental purpose:
1.Grasp the determination method of acid principle
2.The determination of ammonia nitrogen master
Second,the theory is that
2 NH4HCO3 + H2SO4 (too much) (NH4) 2 SO4 + 2 CO2 + 2 H2O
2 NaOH + H2SO4 (left) Na2SO4 + 2 H2O
Three,reagent and instrument:
(1) H2SO4 standard solution
(2) NaOH standard solution
(3) methyl red indicator
Fourth,determine steps:
(1) must say 2 g sample (accurate to 0.0001 g),immediately water will be washed to the first container with a 50.00 ml H2SO4 standard solution of 250 ml tapered bottle in completely dissolved samples to repel the CO2 and 2 3 drops of methyl red indicator with NaOH standard solution to end titration yellow.
(2) the blank test,do not add sample,and sample the determination as same as the analysis steps,the same reagent and the dosage.