hi,
please help me I've got to figure this out for my science homework
what is the chemical word equation for baking soda and lemon juice?
and why is it useful in every day life? What happens when these two substances mix?

Information that you find on the following site may be of help to you. I hope that it is.

Sodium bicarbonate - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Sodium_bicarbonate)

Here's one for the lemon's side of the story:

Citric acid - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Citric_acid)

NaHO3 for baking powder
PPm2c for lemon juice.