[laldibap]

Hi.
If i add citric acid to my tap water the acid destroys the caco3 and mgco3 to form calcium/mag citrate and also co2.
what happens to the co2 , does it evaporate from the solution or does it immediately go into further reaction processes ?
how is the ph affected then ?

[Hunter2]

What do you see, if acid is added to Carbonate? Citric acid is more stronger as carbonic acid.

[laldibap]

it produces a lot of foam. Does this mean the co2 evaporates COMPLETELY ?
I ask this because i did a little experiment with my tap water...
i lowered the ph from 8 to 6 with citric acid but within 12 hours the ph jumps back to approx 7 , why is this happening ?
phosphoric acid on the other hand keeps the ph very very stable

[Hunter2]

A pH adjusted with citric acid should also stay stable. Increase means normally some alkaline material comes in.

[billnotgatez]

co2 evaporates

I know this is semantics but should it be

CO₂ escapes

[laldibap]

ok.

i do not add anything to the tap water except citric acid.
thats why i dont understand how the ph is rising so fast after some hours.
There must be some degradation of the citric acid/citrate or carbonic acid ? Maybe more co2 escapes and makes the ph rise ?
I also read water and co2 produce carbonic acid which can split into hydrogencarbonate , does this happen in my tap water solution ?
Hydrogencarbonat should be alkaline ?