What is the law of conservation of mass?
Matter cannot be created nor destroyed, only transformed.
Why are the group 1 metals called "alkali metals"?
When reacting with water they form alkaline hydroxides
What is the electron configuration of H+? Of H-?
H+: 1s0
H-: 1s2
Define A, a, b and c in the equation A=abc.
A-absorbance
a- absorptivity constant
b- cell width
c- concentration (of absorbing species)
Of sodium, potassium, calcium, magnesium and zinc, which would you expect to react the least/littlest?
Zinc
What is the purpose of phenolphthalein?
To detect the presence of a base/low pH.
Define titration
To find the exact volume of one reagent required to exactly react with another reagent.
Define analyte
The analyzed reagent in a titration.
Define titrant
The reagent used to analyze another reagent in a titration.
Define the terms equivalence point and end point.
Equivalence point: when the number of mols of acid and base are equal
End point: When the indicator changes colour
How many Hs does a monoprotic acid have? A diprotic acid? A triprotic acid?
1,2,3
What is the purpose of phenolphthalein?
To detect the presence of a base/high pH.
What is the generic equation for a monoprotic acid reacting with NaOH?
HA(aq)+ NaOH(aq) -> NaA(aq) + H2O(l)
What is the generic equation for a diprotic acid reacting with NaOH?
H2A(aq)+ 2NaOH(aq) -> Na2A(aq) + 2H2O(l)
What is the generic equation for a triprotic acid reacting with NaOH?
H3A(aq)+ 2NaOH(aq) -> Na3A(aq) + 3H2O(l)
Define A, a, b and c in the equation A=abc.
A-absorbance
a- absorptivity constant
b- cell width
c- concentration (of absorbing species)
What is the generic equation for a triprotic acid reacting with NaOH?
H3A(aq)+ 3NaOH(aq) -> Na3A(aq) + 3H2O(l)
Define A, a, b and c in the equation A=abc.
A-absorbance
a- absorptivity constant
b- cell width
c- concentration (of absorbing species)
What does the symbol %T represent in the equation A=2-log %T
Percent transmittance
Why must HCl be handled with care? (2)
It can cause severe burns and respiratory irritation
How would a blank cell for spectrometry be prepared?
With the appropriate ratios of every component except the one which causes the colour you will measure.
1 ppm = 1 ___/____ What are the missing units?
1 ppm = 1 mg/L
What is the formula for pH?
pH = -log[H+]
What is the formula for Ka?
Ka = [H+][A-]/[HA]
What is the formula for pKa?
pKa = -log Ka
log n = a can be rewritten as n = what?
n = 10a
Ex. log (339) = 2.530 becomes 339 = 102.530
What does M mean? What is it called (in words)
g/mol, molar mass