# When I place a straw in carbontated drink and blow, more gas bubbles rise to the surface?

When I place a straw in carbontated drink and blow (making bubbling noises), more gas bubbles rise to the surface. The gas bubbles which rise to the surface are from the carbon dioxide gas dissolved in the drink, I'm not talking about the air bubbles I made with the straw?

Why does this happen?

• Can you be a little more specific about your "experimental" set up? Maybe while blowing your breath into the drink, you also stir it up a little? – Martin - マーチン May 13 '15 at 14:17

When you blow into a solution, your warm breath (~98.6°F) warms the solution up. As a solution warms up, less $\ce{CO2}$ is soluble. Therefore, blow into a solution, warm it up, less $\ce{CO2}$ is soluble, $\ce{CO2}$ escapes (bubbles out) from the warmer solution.
• Hmm I never considered this simple possibility. I thought the blown air was acting as a nucleation site for removal of the supersaturated $\ce{CO2}$ in solution. Bubbles are good at nucleating other bubbles, which is why opening shaken cans of soda is not a good idea! – Nicolau Saker Neto Apr 24 '15 at 1:56