Unit 7 - Stoichiometry

Question 0

Limiting Reactant

Answer 0

The reactant that gets used up first

Question 1

Titration

Answer 1

Is a method used to determine the concentration of an unknown solution (analyte)
Measure the volume of the solution of known concentration (the known solution - titrant) needed to completely react with a certain volume of the solution of unknown

Question 2

Excess Reactant

Answer 2

Any reactant that remain are called excess reactants

Question 3

Equivalence Point

Answer 3

(Stoichiometric point)

The “point” in the acid-base titration where all the reactants have been used up (and none are in excess)

Question 4

Theoretical Yield

Answer 4

Expected amount (via calculation)

Question 5

Actual Yield

Answer 5

Amount you actually produce

Question 6

Percentage Yield

Answer 6

= theoretical yield
——————- ✖️ 1⃣0⃣0⃣%
actual yield

Question 7

Why actual yield differed from theoretical yield?

Answer 7

Carelessness or sloppiness - reactants improperly measured out or lost due to spills
Produce left behind in the reaction container when collected or transferred
Products may be contaminated - mass would be higher than expected

Question 8

Water contamination

Answer 8

Frequently a source of error during % yield determination.

Prevented by drying samples thoroughly