Chemical Properties Of Water After Ageing

[monkey_wrench]

Hi

I was just wondering weather the chemical properties of water change as it ages for example the chlorine content, hardness. nitrites etc.

Its kinda for a science experiment at school so any help will be appreciated

thanks

 

[Mikaila31]

The chlorine will gas out of the water after about 24hrs. Hardness is hard to say. If the hardness is low I would not expect to much to happen. If the water is on the hard side it may leave a residue, depending on the composition of the container that was holding it and how long it was there. IDK about Nitrites.

You kinda have to know how much of those things you start with in the water to determine how it will change.

 

[monkey_wrench]

umm say the water stats were:

Ammonia 2ppm
Nitrite 5ppm
Nitrate 50ppm
pH 6.5
GH 6

and you left it there for two weeks, would the values still be the same or would they go up or down?

 

[aaronnorth]

well if the water was stagnant, then denitrifying bacteria would populate removing the nitrate, turning it into Nitrogen gas.
Over those 2 weeks nitrosomonas bacteria &Nitrospira bacteria would also be growing, just like in our filters, however, this depends on surface area of the tub, so only a small number may populate, or none at all meaning the ammonia may, or may not change.
Also, you have to consider evaporation, if there is 2ppm NH3 in the water, as soon as evaporation occurs the fihgure will rise as there is less water (providing nothing changes to the ammonia)

there are too many variables to say what might happen.

 

[monkey_wrench]

haha thanks for the reply

i just needed to know if the stats did change so the results wouldnt be a dud and i'd actually have something to graph

anyway im 3 days into the experiment and so far:

Ammonia- stayed the same at 0.5ppm
Nitrate- dropped to 0 from 5ppm after one day and is still at 0
Nitrites- 0ppm
pH- from 7.6 dropped to 7.4 after 3 days
Hardness- Started with 4dh went down to 3dh after 3 days
Cl- Started at 2ppm went down to 0 in a day
Fe- still around 0.02


very interesting results i know

i dont see how the hardness changed though..maybe i have a faulty test kit

P.S Its tap water btw

 

[aaronnorth]

haha thanks for the reply

i just needed to know if the stats did change so the results wouldnt be a dud and i'd actually have something to graph

anyway im 3 days into the experiment and so far:

Ammonia- stayed the same at 0.5ppm
Nitrate- dropped to 0 from 5ppm after one day and is still at 0
Nitrites- 0ppm
pH- from 7.6 dropped to 7.4 after 3 days
Hardness- Started with 4dh went down to 3dh after 3 days
Cl- Started at 2ppm went down to 0 in a day
Fe- still around 0.02

very interesting results i know

i dont see how the hardness changed though..maybe i have a faulty test kit

If you are using hobby test kits then that is why. I would do 2 tests and take an average to get a better result.

 

[monkey_wrench]

cool thanks