if a type of solution begin tested the independent variable or the dependent variable from this solutions; Benedict's solution, Iondine, Biuret's or Sudan IV?
Is the change in color the independent variable or the dependent variable?
In scientific studies (esp. experimental works), we often use independent and dependent variables. An independent variable is the one that we typically vary to study its effect on the system (or its component or properties). A dependent variable is the one that is the outcome of change in another variable. In simpler terms, Independent variable causes a change in dependent variable.
As an example, Benedict's solution is used to determine the presence of reducing sugars. This presence is detected through a color change of the solution. Here, concentration of sugar is the independent variable and its effect will be the change in color of solution, which is the dependent variable.
Similarly, Iodine is commonly used to detect the presence of starch. When the starch is present, the color changes from orange (or yellow) to blue-black. Here too, the color change is the effect of starch presence and hence is a dependent variable.
Hope this helps.
The change in the color would be the dependent variable since it depends on which solution you used.