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Kids in a Candy Store: An Analogy for Back Titration

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Arthur M. Last

Department of Chemistry, University College of the Fraser Valley, Abbotsford Campus, Abbotsford, BC V2S 7M9, Canada

J. Chem. Educ., 1998, 75 (9), p 1121

DOI: 10.1021/ed075p1121

Publication Date (Web): September 1, 1998

Section:

History, Education, and Documentation

Abstract

A simple analogy for back titration is presented. A child is sent into a candy store with a known amount of money in order to purchase a candy bar and the cost of the bar is subsequently determined by counting the amount of change the child brings back. This is analogous to adding excess acid to a base and determining how much base was present by titrating the unreacted acid. The analogy is extended to illustrate what happens when an acidic or basic impurity is present in the system and is further developed to cover a situation in which the acid and unknown base react in a 2:1 ratio rather than a 1:1 ratio.

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Feature):

Applications and Analogies

Keywords (Pedagogy):

Analogies / Transfer

Keywords (Subject):

Quantitative Analysis

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

Aqueous Ammonia or Ammonium Hydroxide? Identifying a Base as Strong or Weak
Michael J. Sanger and Matthew Danner
Journal of Chemical Education2010 87 (11), 1213-1216
- Aqueous Ammonia or Ammonium Hydroxide? Identifying a Base as Strong or Weak
  Michael J. Sanger and Matthew Danner
  Journal of Chemical Education2010 87 (11), 1213-1216
  When grocery stores sell solutions of ammonia, they are labeled “ammonia”; however, when the same solution is purchased from chemical supply stores, they are labeled “ammonium hydroxide”. The goal of this experiment is for students to determine which name ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Canadian Tire Money: An Analogy for Use When Discussing Weak Acid–Strong Base Titrations
Arthur M. Last
Journal of Chemical Education2003 80 (12), 1403
- Canadian Tire Money: An Analogy for Use When Discussing Weak Acid–Strong Base Titrations
  Arthur M. Last
  Journal of Chemical Education2003 80 (12), 1403
  A simple analogy can often provide an instructor with a means of helping students to understand an unfamiliar concept. An analogy involving money can be particularly helpful as most students have experience in dealing with a range of financial ...
  Abstract | Hi-Res PDF | PDF w/ Links