Is the mixture of baking powder and water reversible or irreversible?

The mixture of baking powder and water is irreversible. Here's why:

* Baking powder contains baking soda (sodium bicarbonate) and an acid. When mixed with water, the acid reacts with the baking soda, producing carbon dioxide gas. This is the process that makes baked goods rise.

* The reaction is chemical. Once the acid and baking soda react, they form new compounds. This chemical change cannot be easily reversed by simply removing the water.

* Carbon dioxide escapes. The carbon dioxide gas produced during the reaction bubbles out of the mixture. You can't easily put the gas back in.

In summary: The reaction between baking powder and water produces new substances and releases a gas, making it an irreversible process.