Concerned with identifying the identity of a substance Or whether a specific substance is present ie flame test litmus tests Qualitative Analysis Determining the quantity mass or concentration of a specific substance present in a sample ID: 556160
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Slide1
Limiting and Excess ReagentsSlide2Slide3
Concerned with identifying the identity of a substance
Or whether a specific substance is present
i.e. flame test, litmus tests
Qualitative AnalysisSlide4
Determining the quantity (mass or concentration) of a specific substance present in a sample.
i.e. titrations, precipitation mass
Quantitative AnalysisSlide5
Mass cannot be created or destroyed, it is merely rearranged in space, and changed into different types of particles.
Law of Conservation of MassSlide6
Quantitative analysis can be used to verify the law of conservation of massSlide7
Limiting ReagentsSlide8
Sometimes 1 of the 2 reactants is not completely used up in a chemical reaction…
That’s the LIMITING reagent!
Limiting ReagentSlide9
Write a Balanced Equation for the Reaction
Determine the 2 Reagents involved in the Reaction
Using your 2 givens, Separately solve for your unknown
The species that gives the
smaller
amount of your unknown is your
Limiting Reagent
Use your Limiting Reagent to Figure out how much of your
Excess Reagent
will
Actually React
STEPS TO SOLVING LIMITING REAGENT PROBLEMS:Slide10Slide11
If 20.0mL of 3.0mol/L H2SO
4
(aq) is added to 15mL of 5.0mol/L
KOH(aq
), what mass of water can form?
Example 1:Slide12
350g of KOH(s) is added to 1.00L of 6.0mol/L of H
3
PO
4
(aq). How many moles of which reagent is in excess?
Example 2:Slide13
10.0L of nitrogen gas at 105kPa and 35C are mixed with 33.5L of hydrogen gas at 95.0kPa and 40C and ammonia gas is formed. What mass of ammonia gas will form?
Example 3:Slide14
5.00g of NaOH(s) is added to 50.0mL of 1.25mol/L HNO3(aq). Calculate the mass of water that forms. Determine your Limiting and Excess Reagents. Finally, use your LR to determine how much excess reagent is present.
Example 4 Slide15