This introduction to the lab Parabens in Household Products discusses what the students will do and gain from the activity. The introduction also discusses learning opportunities, assessments, and extensions to the lab.

In this laboratory investigation students will use gas chromatography or liquid chromatography to investigate preservative chemicals found in household products-parabens.

This document is the student pre-lab sheet for the "Parabens in Common Household Products".

Students rotate through a variety of stations in order to demonstrate understanding of the properties of acids, bases, and solutions.

In this activity, students will use titration to measure the alkalinity of a water sample. Students will compare the effects of substrate material on alkalinity. Students will read and discuss the relevance of alkaline chemistry as it relates to natural water resources.

The aim of this experiment is to help establish the idea that the pH of oxides vary. Students will discover that the soluble oxides of metals are alkaline and the oxides of non-metals are acidic.

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Sample Learning Goals
Determine if a solution is acidic, basic or neutral
Place acids or bases in order of relative acidity or basicity
Relate liquid color to pH
Predict how solution volume or dilution with water will affect the pH of acids or bases

Sample Learning Goals
Determine if a liquid is acidic, basic, or neutral
Place acids or bases in relative order
Describe on a molecular scale, with illustrations, how the water equilibrium varies with pH
Determine concentration of hydroxide, hydronium and water at a given pH
Relate liquid color to pH
Predict (qualitatively and quantitatively) how dilution and volume will affect the pH and concentration of hydroxide, hydronium and water