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.

Shape of the Titration Curves

Lab Summary

A titration curve has a distinctive shape that often catches students by surprise. The shape of this curve changes predictably when weak acids are substituted for strong acids. Other parameters can also cause it to change. Once you have an understanding of the fundamental shape, a great deal of information can be derived from a titration curve.

What factors influence the shape of a titration curve?

Theory

Students will manipulate the shape of titration curves.

Method

The student can design, and/or interpret data from an experiment that uses titration to determine the concentration of an analyte in a solution. The student can reason about the distinction between strong and weak acid solutions with similar values of pH, the concentrations needed to achieve the same pH, and the amount of base needed to reach the equivalence point in a titration. The student can interpret titration data for monoprotic or polyprotic acids involving titration of a weak or strong acid by a strong base (or a weak or strong base by a strong acid) to determine the concentration of the titrant and the pKa for a weak acid, or the pKb for a weak base.

Sensors / Equipment Used:

Advanced Chemistry Sensor

(PS-2172)

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

PASPORT High Accuracy Drop Counter

(PS-2117)

Is a professional drop counter that allows students to capture detailed titration data. For use with PASPORT Interfaces.

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.