If a recipe uses 200 ml of nystatin suspension in a mouthwash preparation, what does that contribute to the total volume?

The contribution of nystatin suspension to the total volume of the mouthwash preparation is straightforward; it directly reflects the amount of nystatin used. In this case, the recipe calls for 200 ml of nystatin suspension. Since the question specifies that this is the volume used in the recipe, it makes sense that it contributes precisely 200 ml to the total volume of the mouthwash.

In calculating the total volume of a mixture, each component's volume is simply added together. Here, since only the nystatin suspension volume is provided, it stands alone, affirming that its contribution indeed is 200 ml. Thus, the total volume so far, based on just this ingredient, would begin with this specific amount. There are no extra calculations or additional components to consider here that would affect this value.