carbonic acid[ in fizzy drinks]....will only exist in a solution under pressure....once there is no pressure...the acid[H2CO2] breaks up into CO2 and water!! because it breaks up into co2...it canbe applied to plant leaves as a source of co2!!

However it is not siutable for use as a ph down because the acidity will only last a few hours [ or as long as it takes for a glass of coke to loose it's fizz]


stick to lemon jiuce or vinegar...or just use a ph down :thumbsup: