What is concentration independent variable?
The concentration is the independent variable and the absorbance is the dependent variable. After the curve is created the opposite is true. The user has an unknown concentration (the dependent variable) and a known absorbance obtained by the instrument (the independent variable).
Is solution concentration an independent variable?
Concentration, the independent variable (because it was set by you when setting up the experiment), is graphed on the x-axis. When you measure the absorbance of an unknown sample, find that y-value on the standard curve. 75% of 100 ug/ml = 75 ug/ml concentration.
How do you manipulate independent variables in an experiment?
Again, to manipulate an independent variable means to change its level systematically so that different groups of participants are exposed to different levels of that variable, or the same group of participants is exposed to different levels at different times.
How do you control an independent variable?
In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. The researcher can operationalize (i.e. define) the variables being studied so they can be objectivity measured.
What was the dependent variable in effect of concentration?
R is the reaction rate. This is the dependent variable representing the change in concentration of any species related to time and can be expressed in terms of either reactants or products.
What is the difference between a controlled variable and an independent variable?
Independent variable – the variable that is altered during a scientific experiment. Controlled variable – a variable that is kept the same during a scientific experiment. Any change in a controlled variable would invalidate the results.