Embedded Files
Learning Objectives
Learning Objectives
The application of mass-mass stoichiometry to gravimetric analysis to determine the mass of a salt in a water sample
Volume-volume stoichiometry (solutions only)
Summary Notes
Summary Notes
The topic of stoichiometry is covered across the following topics:
Analysis of Salts in Water
Analysis of Organic Compounds
Analysis of Acids and Bases
As such, a compilation has been made to summarise the main idea of this topic.
Stoichiometry refers to the relationship between the quantities of reactants and products before, during, and following chemical reactions.
These quantities can be amount (mass or moles), concentration, volume or even enthalpy.
Gravimetric analysis is the analysis of masses. Volumetric analysis is the analysis of volumes.
Gravimetric analysis is usually used during a precipitation reaction. Volumetric analysis is often used with a titration.
The main differences between the two analysis can be found here.
Notes on titrations can be found in the Analysis of Acids and Bases topic.
The best method for solving stoichiometry questions is by using a 7 (sometimes 5 if steps 4, 5 and 6 are combined) step process.
Eg. A 10.0g sample of magnesium carbonate (MgCO₃) is added to an excess amount of hydrochloric acid (HCl) and allowed to completely react. Calculate the mass of CO₂ produced.
Steps 3 and 7 will change depending on the quantities provided and desired.
Other mole equations that can be used in steps 3 and 7 are:
Given concentration and volume of a solution
Given substance in question is a gas at SLC
Video to help build your understanding
Video to help build your understanding
Worked Example of Mass-to-mass Stoichiometry
Worked Example of Volumetric Analysis Stoichiometry
Practice Material
Practice Material
Stoichiometry Workbook and Solutions
Gravimetric Analysis Quiz
Volumetric Analysis Calculations
Stoichiometry Calculation Quiz
Teacher's Tips:
Teacher's Tips:
You can never go wrong with the 7 step stoichiometry method.
Always organise your solutions clearly from left to right. This helps the examiner easily determine if you get any consequential marks. Messy working out tends to not get as many marks as it can be difficult to decipher your work.
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