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Your Safer Source for Science
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Item #: PF2099 

Price: $75.00

Engineering Design Challenge

In this lab experience, students are challenged to extract pigments from natural resources to create and test pH indicators. Students will find that natural indicators provide great substitutions for synthetic indicators. The key to creating an effective indicator is picking a natural substance that contains the organic pigment anthocyanin, which changes color as pH changes. Anthocyanins are generally found in flowers and vegetables that are red or purple in color. The pigment is then concentrated by different extraction methods depending on the source. Students will be impressed how well their natural indicators work when measured against a synthetic one. This lab will give them an appreciation of how the chemistry they learn in the classroom applies to the world around them.

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Product Details

Safety: Before conducting the lab, review with the class the safety precautions on the student page. Remind students that acids and bases are skin and eye irritants; and to avoid contact of chemicals with skin and eyes. Students should wear chemical splash goggles and chemical-resistant gloves and apron. Remind students to wash hands with soap and water before leaving the laboratory.

Materials Included in Kit

Buffer capsules to prepare standard acid and base solutions of known pH (pH 2–12)
Bromthymol blue, 0.04%, 35 mL
Methyl orange, 0.1%, 35 mL
Thymol blue, 0.04%, 35 mL
Cranberry apple tea, 4 bags
Grape juice, 100%, 5.5-oz can
Hibiscus, 20 g
Rose petals, 20 g
Acetic acid, CH3COOH, 100 mL
Sodium bicarbonate, NaHCO3, 100 mL
Sodium carbonate, Na2CO3, 100 mL
Sodium phosphate, monobasic, 100 mL
Pipets, 80

Additional Materials Required
Beakers, Borosilicate Glass, 100-mL, 40
Beakers, Borosilicate Glass, 150-mL, 30
DLAB Classic Magnetic Stirrer/Hot Plate, 10
Mortar and Pestle Set, Porcelain, Flinn, 10
Reaction Plates, 24 Wells, 20