Red cabbage apple juice ph baking soda8/10/2023 ![]() What happens when you put red cabbage in lemon juice? This means the air you exhale probably contains carbon dioxide. The gas from your breath should have also changed the cabbage juice to a pink color. The cabbage juice changed from purple to pink with the gas produced by vinegar and baking soda- carbon dioxide. What color does red cabbage change to when carbon dioxide is present? What happens when you mix red cabbage juice with baking soda?īaking Soda is definitely a base and not an acid, so the cabbage juice will turn blue. 6 What kind of solution can you make with red cabbage?.5 How is red cabbage used as an acid indicator?.2 What color does red cabbage turn in salt?.1 What happens when you mix red cabbage juice with baking soda?.This activity is adapted from an activity that originally appeared in the Celebrating Chemistry issue for Chemists Celebrate Earth Day 2010. When instead a base gets in the water, a different reaction happens that changes the indicator molecule and it looks green. When an acid like lemon juice gets in the water, a reaction makes the indicator molecule change shape and it looks pink. It is blue in neutral substances, like plain water. This pigment is a natural acid-base indicator. Red cabbage contains a chemical called anthocyanin. How can you tell if something is an acid or a base? Acids and bases can change the color of substances called acid-base indicators. Some substances are neutral, meaning they are neither an acid nor a base, like water. An example of a base is baking soda, which you might have used in the kitchen to make cookies and cakes. On the other end of the spectrum are bases. Lemon juice and vinegar are both examples of acids. In the table in the printable PDF, record the item, the color the liquid turns, and if it is an acid, a base, or neutral.Ĭhemists classify substances as acids or bases.To test another item, use a clean cup and fresh indicator liquid.Record the color of the liquid in the cup below.Use a dropper or straw to place several drops of the test liquid into the cup with the indicator.Add about 1 tablespoon of the indicator liquid to a small cup.It will remain purple or blue if the test solution is neutral. The color of the cabbage indicator will change to red or pink if the solution is an acid and it will change to green or yellow if it is a base. Your red cabbage indicator should be dark blue in color. ![]() The liquid is your red cabbage indicator. Pour the liquid from the plastic bag into a cup.Hold the bag at the top with one hand and squish the leaves in the water with the other hand for a couple of minutes until the water turns a dark blue.Remove as much air as possible from the bag and seal it. Tear several leaves of red cabbage into small pieces and place into zip-closing plastic bag.The liquids can be safely disposed of down the drain with plenty of water. Wash your hands well before and after the activity.ĭisposal: Dispose of all solid waste in the trash.Be sure to clean up and dispose of materials properly when you are finished with an activity.Tie back long hair, roll up sleeves, and secure loose clothing. ![]()
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