When you mix soda and salt the solute and the solvent would be a variety of things. The best answer i could tell you is that the solute would be the carbonated water and the solvent would be the salt. Or it is the other way around.
The solvent is water; the solute is ground roasted coffee beans (in addition to sugar, salt, cream and whatever else you prefer to add)!
To make a solution you add a solute to a solvent.
A solution's concentration is a measure of solute/solvent. Solute is the thing to be mixed in (i.e. salt in salt water) and solvent is the medium, usually liquid, for the solute to be mixed in (i.e. the water in salt water). Therefore, increasing the ratio of solute to solvent would increase the concentration. This could be done by adding more solute, or removing the solvent (i.e. going back to the salt water, adding more salt, or evaporating water would increase the concentration) The converse of this is also true to decrease the concentration.
Solution
We normally think of a solute as a solid that is added to a solvent (e.g., adding table salt to water), but the solute could just as easily exist in another phase. For example, if we add a small amount of ethanol to water, then the ethanol is the solute and the water is the solvent. If we add a smaller amount of water to a larger amount of ethanol, then the water could be the solute!
Adding solvent will make a solution more diluted. Think of it this way. Take water (solvent) and dissolve salt into it (solute). In order to dilute or increase the ratio of solvent to solute, you would add more water.
Adding more solute to a solution will increase its concentration. Adding more solvent will only dilute it. Think of salt water. The salt is the solute, and water is the solvent. Add salt and it becomes a more concentrated solution. Add more water, and it is more dilute. Simple and easy once you think it through.
Well, honey, you add solute to solvent because that's just how chemistry works. The solute dissolves in the solvent, not the other way around. It's like trying to fit a square peg into a round hole - it just ain't gonna work. So save yourself some time and do it the right way, okay?
When a solvent is added to any solute, the freezing point decreases. (This was not the question asked.) When you add solute to a solid, it depresses the freezing point. An example of this is using salt to melt the ice on roads and sidewalks.
A solute is a substance that will dissolve in a solvent to form a solution. For example, in salt water, salt is the solute (as it is dissolved), water is the solvent (as it dissolves the salt), and salt water is the solution. If you add more water to the salt water so you have a lot more water than salt in the solution, you are diluting it. So basically, dilute means that you add water to a solution to make the concentration of the solute lower.
Increase the amount of solvent.
I shall explain it to you with the aid of an example. If we take some sugar and add it to water, then the solute is sugar and the solvent is water.The solute is always the substance that is dissolved, and the solvent is the liquid in which the solute dissolves.