Will the pH of water change if you "blow" carbon dioxide into it?
Answer:
Sure! In fact, it's a nice demo to show that breath or air in which something carbonaceous burned has CO2; _much_ more effective than using "lime water" (CaOH2) that's supposed to turn milky (but never does, for me, anyway).
Some indicators that work well:
Phenolphthalein with the _slightest_ bit of alkali (e.g. NaOH) is pink, and turns clear after bubbling CO2 through.
Red cabbage soup is a great indicator, containing chemicals that go through the full spectrum over a wide pH range. Tastes good, too, with some salt.
Yes it will. Gazeous CO2 is in equilibrium with soluted CO2 in the water, which is itself in equilibrium with H2CO3, carbonic acid.
Blowing CO2 into water will thus increase the level of soluted CO2 and carbonic acid, and the pH will go down.
When exposed to the CO2 present in the atmosphere, a still body of water already becomes acid. Its pH usually stabilizes between 5 and 6, if you give it some time.
yes, carbon dioxide will generate carbonic acid and the pH will drop.
one way to "blow" co2 in is to drop a small piece of dry ice in - solid co2.
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