Question

how does baking powder help the bread or cake to rise? what is the role of tartaric acid?

Answer 1

Baking soda in a liquid mixture of cake or bread react with the water present in it to give carbon di oxide. It is this carbon di oxide which is responsible for the rise of cake. As the co2 rise through the mixture. The cake rises and pores are formed on it through which co2 comes out.
Baking soda + h20----co2+other products