Advanced Chemistry Through Inquiry Teacher Guide

(PS-2828)

Teacher manual for AP* and Advanced Chemistry labs. Has both the printed version and a flash drive with teacher tips, a PDF of teacher version and editable Word student version.

Introduction to Buffers

Lab Summary

As you have seen in titration experiments, adding one drop of an acidic or basic solution to another solution can result in large changes in pH. However, many biological reactions only work within a narrow range of pH (between about 6 and 8). How does the body, a plant, or the soil keep the pH from changing drastically every time it comes in contact with an acid or base? In this lab, you will investigate solutions that help answer this question.
What is a buffer and what are the components of a buffer solution?

Theory

Students create and analyze a buffer system.

Method

The student can identify a solution as being a buffer solution and explain the buffer mechanism in terms of the reactions that would occur on addition of acid or base.

Sensors / Equipment Used:

Advanced Chemistry Sensor

(PS-2172)

Measure pressure, temperature, pH, and conductivity with the Advanced Chemistry Sensor.

The Associated Bundle:

Chemistry Standard Sensor Bundle

(PS-2927C)

Contains the sensors and probes needed to perform all 17 experiments in the Advanced Chemistry Teacher Guide and all 25 labs in the Chemistry through Inquiry Guide.

Interface Required

This experiment may require software and an interface for data collection.