how can you know weather your chemical reaction is complete or not?

Answer 1

Just perform an analytical checking method.
I use TLC(Thin Layer Chromatography)
Check
http://en.wikipedia.org/wiki/Thin_layer_chromatography
for more info
Run the reactants and product simultaneously on the same plate.
If u find a spot same a that of reactants in the product trail.... tels u that reaction is incomplete...Simple!!

Answer 2

Lancenigo di Villorba (TV), Italy

Hi!
I am very sorry but your question is too many general....
I can you do an example.
In the XIX century, a dutch chemist (G. Mulder) stated a practical rule for define the "precipitimetric chemical equivalent".
Mulder need know how much precipitative reactive might be necessary for the precipitation of its counter-part (analyte).
Mulder wrote that he added the reactive in very late wise so he can appreciate the eventual cloudy aspect of drops he added. In practice, equivalence point overcomes in corrispondence to the first reactive's drop who colours not the analyte liquid. Obviously, Mulder stopped his work at equivalence.
This is only an example.

Bye!

Answer 3

There are many ways:
1. A ppt appears
2. The colour does not change further.
3. Addition of cation or anion results a ppt
4. Addition of solvent (like EtOH) results ppt
5. A smell is obtained, confirming the formation of a new compd.
6. The colour of the reactant mixture changes.
There are many more ways, these were the most common.

Answer 4

Hello there are many analytical and spectroscopic techniques. Depending on the reaction one can easily decide. Anyhow, Thin Layer Chromatography is more commonly used technique. Where you can spot your reactants, product, and reaction mixture in same plate and elute it in suitable solvent. Depending on the polarity all components will move to certain extent. Finally, you expose the eluted tlc plate to either UV light or Iodine vapours or dip in dil. sulphuric acid and ignite on hot plate. you will find different spots. By comparing with your reactant spot/product spot you can decide how much reaction as completed.

Answer 5

a chemical reaction never ends!
although you cannot see it with your naked eye but the chemical reaction never ends

Answer 6

Very simple........................