Yes it is because it isn't a pure substance it has tons of different chemical in it.
Yes
homogeneous
Soda pop is a mixture.
It is a heterogeneous mixture.
uniform
It is a heterogeneous mixture.
Flat soda pop is homogeneous because its bubbles are gone.
Due to a lack of complete diffusion (the bubbles being a definite part of the mixture) the Soda Pop cannot be considered a solution. If the carbination were to be removed and the drink was still considered Soda Pop - then yes, it would be a solution.
Soda is considered a type of homogeneous mixture. It is a mixture that is uniform in composition and contains the same amount of components no matter the serving size.
Its a solution
It is designed to be uniform, because being carbonated it cannot be shaken to mix.
I'm unsure if you mean soda pop or baking soda. A mixture of a small amount of baking soda in warm or hot water can be used to clean the basin of a humidifier. All surfaces should be thoroughly wiped and dried to remove leftover baking soda residue. Do not run the humidifier with the baking soda mixture in the machine, unless you have gotten specific directions to do this from a manufacturer. However, soda pop cannot be used in a humidifier whether to run or to clean it. :-)
In Arizona, you would ask for a soda or a soda pop.