Weathering Limestone , with my own breath! A classroom demonstration of how limestone is weathered

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Resource Type:Classroom Activities; Curricula and Instruction
Grade Level:
6 7 8 9 10 11 12
Organization:Earth Learning Idea (ELI)
Summary:Carry out a laboratory demonstration of the first stages in the chemical weathering of limestone. Quarter-fill a small glass beaker or a boiling tube, with some water of neutral pH and add some Universal indicator. Ask what will happen if a pupil blows steadily into the water through a straw (it pays to choose the most talkative pupil to do this!). Watch what happens as the exhaling continues, and see if the water will turn acid – indicated by the colour changing from green to yellow, to orange or even to pink. Ask pupils to explain why this has happened.
Earth Science Big Ideas:Big Idea 1; Big Idea 3
NGSS Discplinary Core Ideas:ESS2.A
Subjects: 6-8; 9-12; activities; earth; earth science; erosion; geology; geoscience; high school; middle school; minerals; rocks
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