acids

Lesson to determine the relationships between acid strength, Ka, pH, Molarity, and percent ionization

Kristen Drury | Tue, 05/18/2021 - 06:26

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After teaching the concepts and calculations for acid and base strength, concentration, percent ionization, and pH I noticed many of my students were struggling to make meaningful connections between these calculations.This lesson was created to strengthen the understanding of the relationships between these concepts and skills.

Reduction of Permanganate Ion by Acids in Rhubarb, Apples, and Candy

Tom Kuntzleman | Mon, 06/05/2017 - 17:00

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If rhubarb stem is placed in a solution of permanganate, the purple permanganate ion is reduced to the colorless Mn²⁺ ion. It is thought that the oxalic acid present in rhubarb causes this reduction. The investigations presented in this post provide evidence that this may not be the whole story...