Acids
100% - it is strong and dissociates completely
Give an example of a conjugate acid-base pair.
Anything, could be ....
NH3 and NH4+
H2O and OH-
HC2H3O2 and C2H3O2-
What does a buffer do/what is it's purpose?
RESIST changes in pH, not negate
What two things do you have in a titration? What are their names and what do you know about them?
Titrant - what you know the concentration of, you add this to the analyte to find it's concentration
Analyte - what you do NOT know the concentration of
What is voltage?
What acid is made from a SO4^2- ion?
Sulfuric Acid!
What is the pH of a solution with a [OH-] = 3.16x10^-10
pH = 4.5
What are the two criteria for the "best" possible buffer?
1 - high concentration of buffer soln
2 - equal concentrations of acid and base
How many equivalence points does the titration of acetic acid with a strong base have?
ONE
HC2H3O2 - monoprotic
Current is the ______.
flow of charged particles
What is the definition and an example of a binary acid?
Binary acid - made up of two elements with one of them being hydrogen
ex: HCl, HBr, HI, HF, H2S
pH = 14.425
*DIBASIC
Where on a titration curve do you have your best possible buffer - and why?
Half-equivalence point, you have a 1:1 ratio of a weak species and it's conjugate!
What will be the composition of the solution at the 2nd half equivalence point of the titration of H3PO4 with a strong base?
50% H2PO4(-) and 50% HPO4(2-)
The anode gets ______ and the cathode gets _______.
oxidized; reduced
What is a coordinate covalent bond?
When one thing donates a lone pair and the other donates nothing to the bond.
What bases play a part in both a proton transfer reaction and an acid-base neutralization reaction?
Proton Transfer - bronsted lowry
Acid-Base Neutralization - arrhenius
Is this a buffer?
HCl and Cl ion
NO, a buffer is a WEAK species and it's conjugate
What is the purpose of a titration?
to determine the concentration of an acidic or basic species
- NOT TO DETERMINE pH
Copper Reduction Potential E = +0.34V
Zinc Reduction Potential E =-0.76V
What is the voltage of this battery?
1.1 V
*spontaneous, will DO work, negative delta G
Find pH of a solution that is 0.25M NH3(aq), the Ka of NH4+ is 5.8 *10^-10
pH = 11.32
*find Kb so you can do the square root equation!
Which of the following species create a basic solution:
1 - NaOH
2- Ca(OH)2
3- NaC2H3O2
All of them !!
1 - strong base
2 - strong base that is DIBASIC
3 - spectator ion and strong conjugate base
What is the pH of an equimolar buffer solution of H2PO4(-) and HPO4(2-)?
*the Ka for this solution is 6.17x10^-8
7.21 = pH
What [HClO4] is needed if 0.800L of 1.5 MLiOH is used to titrate 300mL of acid?
4M HClO4
You run a current for 1 minute and 8.15 x 10^-18 electrons pass. How many moles of Fe 3+ would be reduced?
Moles of iron: 1.35 x 10^-5 mol / 3 = 4.51 x 10^-6