The Establishment of a Chemical Equation Using the Method of Continuous Variation.

1628 Words Oct 14th, 2012 7 Pages
chem labYoav Arjang 9/30/2012
AP Chemistry Lab Report

I. Introduction:

a) Title: The Establishment of a Chemical Equation Using the Method of Continuous Variation.

b) Purpose: the continuous variation method is used to establish a chemical equation by displaying on a line graph the change/difference in temperature caused by the composition of acids and bases in the solution.

II. Apparatus and Materials:

A) Goggles
B) Acid
C) Base
D) Digital Thermometer
E) Pipet (10ml and 100 ml)
F) Buret
G) Plastic foam cup
H) Beaker

III. Outline of Procedure: For each system, measure the quantities of the
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The delta H is 12.6 Kcal/ moles of base.

2MOH + H(2)X M(2)X + 2H(2) O

VI. Conclusion: .016/.016= 1, .034/.016= 2.125

Acid: Base ratio

2:1

Percent error: (2-2.125)/2 (100)= 6.25%

2MOH + H(2)X M(2)X + 2H(2) O

An acid-base titration is the determination of the concentration of an acid or base by exactly neutralizing the acid/base with an acid or base of known concentration. This allows for quantitative analysis of the concentration of an unknown acid or base solution. It makes use of the neutralization reaction that occurs between acids and bases and the knowledge of how acids and bases will react if their formulas are known. Acid–base titrations can also be used to find percent purity of chemicals.

Method: Before starting the titration a suitable pH indicator must be chosen. The equivalence point of the reaction, the point at which equivalent amounts of the reactants have reacted, will have a pH dependent on the relative strengths of the acid and base used. The pH of the equivalence point can be estimated using the following rules:
A strong acid will react with a strong base to form a neutral (pH=7) solution.
A strong acid will react with a weak base to form an acidic (pH<7) solution.
A weak acid will react with a strong base to form a basic (pH>7) solution.
When a weak acid reacts with a weak base, the equivalence point solution will be basic if the base is stronger and acidic if the acid is stronger. If both are of equal strength,

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