Innovating Science® - Determination of the Hardness of Water AP Chemistry Kit
SKU
Innovating_Science_IS8020
Manufacturer No
IS8020
Manufacturer ID - IS8020
Students will learn about acids and bases through a class discussion and then test a dilute acid and dilute base with neutral litmus paper to learn how the paper indicates something is acidic or basic. Once that skill is learned they can move on to test some common items that would be found around their house to determine if they are acids or bases. Optional: Extra litmus paper is included to test more items either from home or around the school building for a greater understanding of acids and bases. The activity contains enough materials for 6 groups of students.
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Description
In this experiment the indicator eriochrome black T (EBT) is used to signal the presence of ions in the water sample. EBT binds with free metal ions in the water to form a pink complex. EDTA has a stronger affinity for the metal ions than EBT so when EDTA is added it replaces the EBT and the EBT returns to its blue, uncomplexed color. The blue color is used as the end point in the titration. A sample of tap water is treated with EBT indicator. If the indicator turns from blue to pink, metal ions such as calcium and magnesium are present. To determine the concentration of ions present, the sample is titrated with a known molar concentration of EDTA.
Kit Includes:
4 x 500mL EDTA Solution, 0.005M
2 x 200mL Buffer Solution
2 x 15mL EBT Solution (Eriochrome Black, 0.1%)
DOT Info:
Small quantity exemption 173.4
THIS PACKAGE CONFORMS TO 49 CFR 173.4 for domestic highway or rail transport only
Kit Includes:
4 x 500mL EDTA Solution, 0.005M
2 x 200mL Buffer Solution
2 x 15mL EBT Solution (Eriochrome Black, 0.1%)
DOT Info:
Small quantity exemption 173.4
THIS PACKAGE CONFORMS TO 49 CFR 173.4 for domestic highway or rail transport only
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