# Does citric acid react with carbonated water?

I've noticed that when adding lemon juice to carbonated water, large 'soapy' bubbles appear on the surface. Since I'm adding another acid to a solution of carbonic acid, I would maybe expect a faster release of $\ce{CO2}$, but the bubbles I'm seeing do not resemble the usual fizzy drink bubbles.

What's going on?

• Lemon juice is more than just citric acid. Have you tried the same experiment with pure citric acid (should be available in the baking section of a supermarket)? – Richard Terrett Jan 19 '13 at 0:57