Analysis of urine .. Detection of water and mineral salts and nitrogen gas and ammonia

We reveal water in the urine:
Experiment: Paul + tube test + heat
Note: The rise of steam + form drops of water.
Result: Urine consists of water.
We detect mineral salts in the urine:
Experiment: Paul + test tube + silver nitrate.
Note: Make up a black deposit that does not prevail in heat.
Result: The urine contains mineral salts.
We detect nitrogen gas in the urine:
Experience: Paul + Javell water + heat
Note: Nitrogen gas is emitted in the urine.
Result: Urine is made up of nitrogen gas.
We expose the ammonia in urine:
Experiment: Paul + test tube + soda solution or potash concentrate + thermal source.
Note: Vapors emit strong odor.
Result: Urine is formed on ammonia.