Quiz 1 Flashcards
Theoretical Yield
quantity of product expected
Experimental yoeld
Quantity of product that ACTAULLY ends up
Percentage Yield
Experimental/theoratic x 100%
What factors might hinder percentage yield
transfer errors (Particles stick to glassware)
Contamination
Oxidation
Not ideal conditions
Impurities of reactant
Filter paper not completely dry
scale is old
Stoichiometric ratio is also known as molar ratio
molar ratio
Mole ratio
given by coefficients of BCR
What is gravimetric stoichiometry
Weighing substance on scale
General idea of gravity stoics
Given mass to moles given to moles required to mass
What is a reagent
an reactant
Limitng reagent qualities
limits quantity of product formed
runs out first
used to predict amount of product
most valuable
Excess Reagent
Quantity remains once reaction is done
DO PRACTICE DETERMINING quantity of excess regnant remaining
!!!
Which equation for solution stoic
c=n/v
Which equation for gas stoics
PV=nRT
What is STP
0 degrees celsius, 101.325 kpa
What is SATP
25 degrees, 100 kpa
what is R constant
8.314 x p x v / mol x K
What is pH curve
a graphical representation of acid-base titration
Parts of titration (the diagram)
stopcock
tip
erlenmeyer flask
burette
base
retort stand
meniscus
What is y axis of ph curve graph
pH of sample flask
What is x-axis of pH curve graph
volume of titrant added to sample
What is endpoint
y coordinate that indicated pH=7
There is a colour change
What is equivalence point
x coordinate that shows what volume of titrant needed to reach desired endpoint
perfect amount for neutralization
What do sections of pH curve mean?
they show how as ions of base or acid are added, the ph starts to sharply curve until it plateaus
An appropriate indicator
bromothymol blue - its has 7 in the middle of it
