stoich

Question 1

percentage yield

Answer 1

what you produce experimentally, compared to what was theoretically possible

Question 2

theoretical yield

Answer 2

quantity of product expected to be produced if everything goes perfectly

Question 3

experimental yield

Answer 3

the quantity of product actually produced

Question 4

percentage yield equation

Answer 4

experimental/theoretical x 100%

Question 5

limiting reagent

Answer 5

reactant that limits the quantity of product formed

Question 6

excess reagent

Answer 6

reactant that still has some quantity remaining once the reaction is done

Question 7

stoichiometry

Answer 7

the study of relationship between quantities of reactants and products involved in a chemical reaction

Question 8

what is the relationship in stoichiometry?

Answer 8

molar coefficients of the balanced chemical reaction

Question 9

mole ratio

Answer 9

“stoichiometric ratio”; given by the coefficients of the BCR

Question 10

Gravimetric stoich solves for…

Answer 10

a chemical’s mass

Question 11

general idea of gravimetric stoich

Answer 11

1. given mass –> moles
2. connect given moles –> required moles
3. required moles –> mass

Question 12

pH curve

Answer 12

graphical representation of the progression of an acid-base titration

Question 13

how is the pH curve obtained?

Answer 13

performing a titration of one reactant into a sample flask of the other reactant

Question 14

if the tip of the burette is perpendicular, then..

Answer 14

the tip is closed

Question 15

if the tip of the burette is parallel, then..

Answer 15

the tip is open

Question 16

what is the burette estimated to compared to what it’s calibrated to

Answer 16

estimated to a hundredth, calibrated to a tenth of a mL

Question 17

parts of pH curve when a strong acid is titrated into a strong base

Answer 17

1. OH- only in sample
2. H3O+ being added
3. small quantity of H3O+ being added results in dramatic decrease in pH
4. excess H3O+ (OH- is neutralized)

Question 18

endpoint

Answer 18

(y-coordinate) pH @ which the acid and base neutralize

Question 19

appropriate indicators in a titration

Answer 19

an indicator with a pH=7 will be a midpoint colour
- bromothymol blue
- phenol red

Question 20

equivalence point

Answer 20

(x-coordinate) volume of titrant required to perfectly neutralize sample

Question 21

parts of a pH curve when strong base is titrated into a strong acid

Answer 21

1. excess H30+
2. equivalence point ( pH increases dramatically as more OH- is added)
3. excess OH-

Question 22

solution stoich equation

Answer 22

c=n/v

Question 23

what does solution stoich solve for

Answer 23

volume and concentration

Question 24

what does gas stoich solve for

Answer 24

volume

Question 25

gas stoich equation

Answer 25

PV=nRT

Question 26

R constant

Answer 26

8.314

Question 27

STP

Answer 27

101.325 kPa
0C

Question 28

SATP

Answer 28

100kPa
25C

Question 29

titration

Answer 29

used to determine the concentration of a solution when the concentration of one solution is known and the volume of both solutions is known

Question 30

how can the concentration of an unknown solution be determined (reference to titration)

Answer 30

-pH curve
-multi-trial titration

Question 31

multi-trial titration

Answer 31

titrant is added to the sample, but the titration is stopped when the endpoint is reached

Question 32

how to determine the volume of titrant required to enutralize the sample

Answer 32

Vf - Vi

Question 33

why are multiple trials done in multi-tiral titrations

Answer 33

• improve precision/reliability of results
• eliminate outlying trials

Question 34

how are trials selected from multi-trial titrations

Answer 34

3 trials within +/- 0.20 mL

Question 35

titration data table title

Answer 35

titration os xxxx mL (xxx mol/L) sample with (xxx mol/L) titrant