Topic 1
Cu, Au, Al, or Ag?
Al
What are the products of a neutralization reaction?
Water and a salt
What is the pH of an acid with an H+ concentration of 10^-3?
pH=3
What is the definition of a Bronsted-Lowry acid and a Bronsted-Lowry base?
Bronsted-Lowry acid: a substance that can donate an H+ ion/proton.
Bronsted-Lowry base: a substance that can receive an H+ ion/proton.
Will this reaction occur, and if so, what are the products?
Zn + HCl---> ?
ZnCl2 + H2
What is the missing reactant in this neutralization reaction?
2HNO3 + ? ---> 2HOH + Mg(NO3)2
Mg(OH)2
If stomach acid has a pH of 2 and orange juice has a pH of 3, how many times more acidic is stomach acid than orange juice.
Stomach acid is 10 times more acidic
State the conjugate acid for the following Bronsted-Lowry bases:
a. C2H3O2-
b. HSO4-
a. HC2H3O2
b. H2SO4
Name 2 properties of an acid or 2 properties of a base.
Acid: pH less than 7, they oxidize metals, acidic solutions conduct electricity, they taste sour, they react with carbonates to produce carbon dioxide.
Base: pH greater than 7, basic solutions conduct electricity, taste bitter, formed when group 1 and 2 metals react with water, they hydrolyze fats (saponification)
What is the difference between the endpoint and equivalence point of a titration?
Endpoint: The pH at which an indicator that has been added to a titration setup turns color.
Equivalence point: The point at which the titrated solution has a pH of 7. The concentration of hydronium is equivalent to the concentration of hydroxide.
A pH of 13 is how many times more basic than a pH of 8?
100,000 or 10^5
Identify the conjugate acid/base pairs for the following reaction:
HBr + H2O ---> Br- + H3O+
HBr= acid, Br-= conjugate base
H2O= base, H3O+= conjugate acid
Name the following acids:
a. H2SO3
b. HF
a. Sulfurous acid
b. Hydrofluoric acid
What volume of 0.50 M H2SO4 is required to neutralize 100. mL of 0.50 M NaOH?
50. mL of H2SO4
An acid with which pH would be a better conductor of electricity, one with pH=5 or pH=2? (Explain.)
pH=2
Identify the conjugate acid/base pairs for the following reaction:
H2SO4 + OH- ---> HSO4- + H2O
H2SO4: acid, HSO4-: conjugate base
OH-: base, H2O: conjugate acid
What is a possible pH of a solution that turns methyl orange to yellow, thymol blue to yellow, and bromothymol blue to yellow?
pH between 4.4 and 6.0
How many moles of KOH are required to neutralize 100. mL of 2.0 M HCl?
0.20 moles of KOH
Which indicator would be a better choice to estimate the equivalence point when titrating NaOH with HCl?
phenolphthalein or methyl orange? (Explain why.)
phenolphthalein
Why is water amphoteric? Provide another example of an amphoteric compound.
Water can gain an H+ or lose an H+.
HSO4-, HCO3-, H2PO4-, HPO4-2, HSO3-