Conversions
Buffers/Titration
Hydrolysis
Identities
Acid deposition
100
kb of a base equals 5.0 x 10^-2. what is ka?
2.0 x 10^-13
100
is methyl orange a suitable indicator for the reaction between a weak acid and strong base?
no
100
what is salt hydrolysis?
the reactions of acids and bases to form a salt and water.
100
what is a lewis acid?
an electron pair acceptor
100
is fog a type of acid deposition?
yes, if it contains acidic pollutants
200
a base has pH= 12.2. what is the pOH of the base?
1.8
200
define buffer region
the area where a solution is relatively resistant to pH change as it is titrated
200
what will the approximate pH of the reactions of a strong acid and base be at 298k?
neutral~7
200
sort the acids as weak and strong:
hydrochloric acid
ammonium
sulfiric acid
nitric acid
strong: HCL, H2SO4, HNO3
weak: NH4+
200
does acid deposition cause erosion or corrosion?
both- marble and limestone are erroded, and metals are corroded
300
a solution has pH= 3.0. what is [OH-]?
10^-11 mol dm-3
300
where does pH=pKa in titration?
half equivalence point, because [HA]=[A-]
300
write the equilibrium equation for the solution of a salt with a weak base and strong conjugate acid
(B+) + H2O <-> BOH + H+
(acidic solution)
300
what is a bronsted-lowry base?
an H+ acceptor
300
why is natural rain acidic?
dissolved CO2 reacts with water to form carbonic acid, which dissociates into H+
400
pKa of a HF solution is 3.17. what is kb of the solution?
1.5 x 10^-11 or 1.0 x 10 ^ -10.8
400
what are the two ways to make a buffer solution?
-add excess weak acid/base to a strong one
-mix an acid/base with a salt of its conjugate
both techniques form a solution with equimolar amounts of unreacted acid/base and its salt
400
why does ammonium nitrate form an acidic solution?
ammonium is a weak acid and nitrate Acts as a spectator ion in the dissolution of the salt.
400
sort the bases as weak/strong
ammonia
sodium hydroxide
potassium hydroxide
methylamine
strong: NaOH, KOH
weak: NH3, CH3NH2
400
How does SO2 cause acid rain?
it reacts with O2 to make SO3, then disolves in water to make sulfiric acid
500
a solution of .108 M hydrocyanic acid (HCN) has a pH of 5.09 at equilibrium. What is the expression to find ka?
(10^-5.09)^2/(.108-10^-.509)= Ka
500
this curve shows the reaction between a ___ acid and ____ base.
strong, weak
500
what do you need to know to determine the relative acidity/alkalinity of a solution of weak base and weak acid?
Ka and Kb values
500
what is an arrhenius acid?
dissociates into H+ in water
500
Name three consequences of acid rain
-leaching in plants (minerals become soluble and wash away)
-marble and limestone erosion
-acidity in aquatic ecosystems
-sulfate and nitrate particles cause respiratory issues.