Catastrophic Currants!

Today we did an experiment where we added bicarbonate of soda to white vinegar, and then added a small handful of currants.  We could see the currants being taken to the surface with the bubbles and then float back down again once the bubbles burst!  We wondered what gas those bubbles were?  How did the bicarbonate of soda change? What would that chemical equation look like?  Watch this space as we unravel the answers!