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Red Cabbage PH Indicator

Red Cabbage PH Indicator. GÜNEŞ KANAR 10C-70. Preview information;. Red cabbage contains a pigment molecule called flavin (an anthocyanin ).

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Red Cabbage PH Indicator

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  1. Red Cabbage PH Indicator GÜNEŞ KANAR 10C-70

  2. Preview information; • Red cabbage contains a pigment molecule called flavin (an anthocyanin). • This water-soluble pigment is also found in apple skin, plums, poppies, cornflowers, and grapes. Very acidic solutions will turn anthocyanin a red color. • Neutral solutions result in a purplish color.

  3. Basic solutions appear in greenish-yellow. Therefore, it is possible to determine the pH of a solution based on the color it turns the anthocyanin pigments in red cabbage juice. • The color of the juice changes in response to changes in its hydrogen ion concentration. pH is the -log[H+]. • Acids will donate hydrogen ions in an aqueous solution and have a low pH (pH < 7). • Bases accept hydrogen ions and have a high pH (pH > 7).

  4. Materials:These are the materials that we are using during the experiment. • red cabbage • blender or knife • boiling water • filter paper • One large glass beaker • Six 250 mLbeakers • household ammonia (NH3) • baking soda (sodium bicarbonate, NaHCO3) • washing soda (sodium carbonate, Na2CO3) • lemon juice (citric acid, C6H8O7) • vinegar (acetic acid, CH3COOH) • seltzer water (carbonic acid, H2CO3) • muriatic acid or masonry's cleaner (hydrochloric acid, HCl) • lye (potassium hydroxide, KOH or sodium hydroxide, NaOH)

  5. Procedure; • Chop the cabbage into small pieces . • Place the cabbage in a large beaker and add boiling water to cover the cabbage. Allow at least ten minutes for the color to leach out of the cabbage. • Filter out the plant material to obtain a red-purple-bluish colored liquid. This liquid is at about pH 7.

  6. Pour about 50 - 100 mL of your red cabbage indicator into each 250 mL beaker. • Add various solutions to your indicator until a color change is obtained. • Use separate containers for each household solution . • Be amazed as the beautiful colors dazzle and delight your eyes.

  7. Results: • Your red cabbage juice is a simple pH tester. It reacts differently to different substances. • Once you know what colour the juice turns in acids and alkalis, you can use it to test other liquids.

  8. Why It Happens: • Red cabbage has pigments which react differently to acids and alkalis. • When you dip the strips into a substance and wait for a few minutes, the colour will fully develop. • The indicator strips turn red-yellow in acid, green in neutral and purple-blue in alkali.

  9. END ........

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