|
1.
If the water sample is without any restrain ability, the
copper powder will turn to black and green color above the water
after 2~3 minutes, and the liquid is turn to blue gradually.
2.
If the sample has no any restrain ability, the yellow
copper power will totally be dissolved less than 10 minutes, the
liquid is turn to Cu(NO3)2 (Blue Color).
3.
If the water can restrain the oxidize reaction, which means
having energy, and it can totally stop reaction of copper and
strong nitric acid. The yellow copper powder will still keep
golden color and shining. |