Solution Stoichiometry and Chemical Analysis

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Section 4.6

• Solution Stoichiometry and Chemical Analysis

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New Stoichiometric Approach

• Chp 3
• Grams of substances
• Used molar mass to calculate moles
• Chp 4
• Concentration of substances
• Use molarity and volume to calculate moles

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Molarities in Stoichiometry
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SAMPLE EXERCISE 4.15 Using Mass Relations in a
Neutralization Reaction
How many grams of Ca(OH)2 are needed to
neutralize 25.0 mL of 0.100 M HNO3?
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Titration

• Calculate concentration of a solute in a solution
• React soln of unknown conc with soln of known
  conc (standard solution)
• A-B, precipitation, or redox reactions

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Titration Procedure

• Measure specific volume of unknown conc soln
• Slowly add standard soln until reaction is
  complete
• Equivalence Point

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Equivalence Points

• A-B titrations
• Dyes used as A-B indicators
• Colorless in acids/pink in bases

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Homework

• 4.82-4.85 and 4.87-4.88, p. 161-162