Vitamin C Detection with DCPIP

What is the chemical name for Vitamin C?

• Citric acid

• Ascorbic acid

• Acetic acid

• Lactic acid

What is the role of Vitamin C in the body?

• Acts as an oxidising agent

• Acts as a reducing agent

• Acts as a neutralising agent

• Acts as a dehydrating agent

What is DCPIP used for in the experiment?

• To oxidise Vitamin C

• To reduce Vitamin C

• To indicate the presence of Vitamin C

• To neutralise Vitamin C

What colour change indicates the presence of Vitamin C when using DCPIP?

• Blue to red

• Blue to green

• Blue to colourless

• Blue to yellow

What is the purpose of titration in this experiment?

• To measure the acidity of the solution

• To determine the amount of Vitamin C in a solution

• To measure the pH of the solution

• To determine the boiling point of the solution

Which apparatus is NOT needed for the Vitamin C detection experiment?

• Pipette

• Stopwatch

• Bunsen burner

• Test tubes

How is the concentration of Vitamin C in unknown fruit juice samples determined?

• By measuring the pH

• By using a calibration curve

• By boiling the juice

• By using a thermometer

What is the control variable in the Vitamin C detection experiment?

• The amount of DCPIP used

• The type of fruit juice used

• The shaking time for each sample

• The temperature of the solution

What is the first step in the method summary for Vitamin C detection?

• Add 1 cm³ of DCPIP to a test tube

• Prepare a series of known Vitamin C concentrations

• Record the volume needed to turn the solution colourless

• Plot results as a calibration curve

What is the unit of volume used in the experiment for adding DCPIP?

• Litres

• Millilitres

• Ounces

• Cubic metres