Titration
An indicator, phenolphthalein, turns what color in the presence of base?
a) Orange
b) Black
c) Colors of the rainbow
d) Pink
d) Pink
A strong acid will tend to have a
a) low pH
b) high pH
c) neutral pH
d) pH the same as water
a) low pH
A base will give what when dissociated in an aqueous solution?
Hydroxide ions, OH- ions
An acid, by definition, will give
a) Protons
b) Hydroxides
c) Cl- ions
d) Na+ ions
e) it depends
a) Protons
What color eyes does Mr. Shin have?
Brown
A student forgot to add phenolphthalein in a titration lab. What will happen?
Nothing will happen lol
A solution has a pH of 3. The pOH of the solution is
11
(14 - 3 = 11)
The concentration of HCl can be represented as
a) [H+]
b) [H3O+]
c) [acid]
d) [HCl]
e) all of the above
Which of the following is a base?
a) H2SO4
b) H2O
c) Ca(OH)2
d) KCl
e) HCl
c) Ca(OH)2
Mr. Shin is terrible at
a) Running
b) Ping Pong
c) Basketball
d) Ice Skating
e) Swimming
c) Basketball
Ben, Mr. Shin's son, loves dropping the base into an acidic solution. Even when the solution turned pink, Ben said "lol imma add more base yeah" and added 30 mL of additional base. Why would this be bad?
The amount of base needed to reach the endpoint would be catastrophically off. Calculation for the concentration would be inaccurate
M = mol / L
Find the pH and pOH
-log(.30) = .5228
pH = .5228
14 - .5228 = 13.47
pOH = 13.47
The pOH of a solution is 11.0
What is the [OH-]?
1 x 10-11
Water
a) Will always act as an acid
b) Can act as a base or acid
c) Will always act as a base
d) Will neither act as a base or as an acid
b) Can act as a base or acid
In High School, Mr. Shin got a C in
a) History 2nd year
b) Physics 1st year
c) Geometry 1st year
d) Statistics 3rd year
e) English 1st year
b) Physics 1st year
David had an acidic solution of HCl. David added 4 to 5 drops of the indicator, phenolphthalein, into the acidic solution. However, David forgot to titrate with base and instead titrated with more acid. Would this be okay?
Not okay. You would not see any color change.
5 grams of HCl is dissolved in 500mL water. What is the pH of the solution?
Hint*
molar mass = g / mol
M = mol / L
molar mass = g / mol
36.5 = 5 / mol
mol = .1369 mol H+
M = mol / L --> .1369 / .5 = .2738
-log (.2738) = .56 --> pH = .2738
The pH of a solution is 3.0
What is the concentration of [H+]?
.001
A strong acid, compared to a weak acid, simply gives more ___________ when dissolved/dissociated in an aqueous solution.
H+ ions, hydrogen ions, hydronium ions, protons, etc.
Mr. Shin currently lives in
a) Framingham
b) Watertown
c) Newton $$$
d) Waltham
e) Cambridge
d) Waltham
The first trial of a titration usually takes much longer than the second and third trials. Y.
Because after the first trial, you have a general idea of how much base it takes to reach the end point. Technically, you could have streamed the base instead of adding it drop by drop for the 2nd and 3rd trials.
10 g of H2SO4 is dissolved in 600 mL of water. What is the pH?
Mr. Shin will do this on the board
I have a solution with 1 x 10-7 mols of [H+]. I have a 1:1 ratio of acid and base. I also have 400 mL of the solution. What is the concentration of base?
1 x 10-7 / .4 = 2.5 x 10-7
[OH-] = 2.5 x 10-7
hydrogen and hydroxide ions
In college, Mr. Shin did not
a) Perform in a kpop dance at a Korean festival
b) Make many friends in the Jewish community
c) Write up intoxicated residents as a RA
d) Write for the Brandeis Student Newspaper
d) Write for the Brandeis Student Newspaper