What is the independent, dependent, and control variable of the Benedict\'s test

Question

What is the independent, dependent, and control variable of the Benedict's test, Lugol's test and Buret's test? The picture above shows the procedure. Thank you! carbohydrate identification 2 test tubes were labeled as negative and positive 2mL of Hzowere need t for the negative test tube and 2 mL of CoH12oefor the positive test tube No more than 2 ml of Benedict's solution were needed for each test tubes, Boiled H20 was used toinsert the test tubes for 3 minutes. Results were recorded. .Testing for disaccharides such as maltose, sucrose and lactose Benedict's test 4 test tubes for maltose, lactose, sucrose and starch were labeled 2 mu of each carbohydrate were need t for the 4 test tubes. 2mu of Benedict's soution was used for the 4 test tubes, The test tubes were inserted in bolled Hofora minutes. The data was recorded

Explanation / Answer

What is the independent, dependent, and control variable of the Benedict's test, Lugol's test and Buret's test?

Let’s make the definitions of these variable clear, before going to answer the question.

A variable is something that can be measured or manipulated in an experiment.

There are two types of variables that exist in most experiments: Independent and dependent variables.

• Independent variables are factors that can be changed or manipulated by user.

• Dependent variables are factors that are measurable and change, because of the independent variable.   The dependent variable depends on the independent variable.

A control is something that all other test results can be compared with.

Benedict’s test

Independent variable: Benedict’s solution, Boiling water.

Dependent variable: Color of the solution after the Benedict’s solution has been added.

Control: Solution with No benedict’s solution added, preferably only water.

Lugol's test

Independent variable: Lugol's solution, pH. ( Since low pH is required for this reaction)

Dependent variable: Color of the solution after the Lugol's solution has been added.

Control: Solution with No Lugol's solution added, preferably only water.

Biuret test

Independent variable: Biuret solution

Dependent variable: colour of the protein solution after the biuret solution has been added.

Control: Solution with No Biuret reagent added, preferably only water.

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