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- Grade Range
- 4th
- Rating
Students make cabbage water to test color change when acids and bases are added to it. They observe the colors of the pH scale and associate certain colored litmus paper with acids or bases. Full Review »
- Grade Range
- 1st - 8th
- Rating
Students classify liquids as an acid, base or neutral. They use purple cabbage juice as an indicator to test several liquids in order to group them as acids, bases or neutrals. Full Review »
- Grade Range
- 7th - 8th
- Rating
Students experiment to determine the differences between acids and bases using litmus paper, pH paper and indicator solutions. Full Review »
- Grade Range
- 9th - 12th
- Rating
Students evaluate the relationship between oxygen levels and the amount of organic matter in an aquatic ecosystem. They explain the relationship between oxygen levels, bacteria and the breakdown of organic matter using an indicator solution. Full Review »
- Grade Range
- 9th - 12th
- Rating
Students observe a demonstration in which a bottle containing a colorless solution is mixed, turns blue, then becomes colorless again. They record observations, form and discuss hypotheses, and draw a conclusion based on the evidence. Full Review »
- Grade Range
- 9th - 12th
- Rating
Students complete this experiment in two weeks. During the first lab period, students determine the conditions for a precise, reproducible titration of a brine solution with sodium hydroxide and the indicator, phenolphthalein. During the second week, students titrate pickle juice. They need to solve the problem of the interfering color of the pickles and decide if a more dilute solution of sodium hydroxide would be appropriate. Full Review »
- Grade Range
- 9th - 12th
- Rating
Students investigate the mixtures of solutions. They utilize cups filled with bases and acids. Students test and determine the pH of each cup. The multiple cups are compared to each other in order to chart acids and bases according to pH levels. Full Review »
- Grade Range
- 9th - 12th
- Rating
Students access economic statistic to determine hints about the state of the economy in the future. They look at these economic indicators online to determine how they are used to predict business cycles. They write an essay describing the use of economic indicators. Full Review »
- Grade Range
- 8th - 12th
- Rating
Students describe characteristics and common uses of acids and bases. They describe the role of natural indicators in the chemistry of acids and bases after testing and making observations on a variety of plant extracts. Students observe that dyes from plants have distinct physical and chemical properties. Full Review »
- Grade Range
- 5th - 8th
- Rating
Students explore the use of acid and base pH indicators. The teacher saturates an indicator sponge with congo red solution. Afterwards, the sponge is placed in a blue base solution. Students observe that the blue sponge actually turns red. They discuss the explanations for the color change. Full Review »
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