pH
What is pH?
Measure of H+ conc.
How acidic or basic a substance is
The indicator methyl orange is red in an aqueous solution that has a pH value of
(1) 9.2 (3) 4.5 (2) 7.0 (4) 2.7
2.7
What does a neutralization reaction always produce?
Salt and a water
What lab equipment do you use to perform a titration?
Burette
Acids release ______ in solutions.
Bases release _____ in solutions.
Acids H+/H3O+
Bases OH-
What is a electrolyte?
Substance that dissociates in to ions in solution.
State the color of bromcresol green if added to a KOH solution.
Blue
Identify which reaction below is a neutralization reaction.
A) 2 HCl + Zn --> ZnCl2 + H2
B) 6 Li + N2 --> 2 Li3N
C) 2 KOH + H2SO4 --> K2SO4 + 2H2O
D) Ba(OH)2 + Cu(NO3)2 --> Ba(NO3)2 + Cu(OH)2
C) 2 KOH + H2SO4 --> K2SO4 + 2H2O
During a laboratory activity, a student places 20.0 mL of HCl(aq) of unknown concentration into a flask. The solution is titrated with 0.10 M KOH(aq) until the HCl(aq) is exactly neutralized. At the end of the titration, the volume of KOH(aq) added is 42.0 mL.
Determine the concentration of the HCl(aq) solution using the titration data.
0.21 M
Which statement describes a 0.1 M NaOH(aq) solution?
(1) The solution contains an Arrhenius acid and conducts electricity.
(2) The solution contains an Arrhenius acid and does not conduct electricity.
(3) The solution contains an Arrhenius base and conducts electricity.
(4) The solution contains an Arrhenius base and does not conduct electricity.
(3) The solution contains an Arrhenius base and conducts electricity.
When the concentration of hydrogen ions in a solution is decreased by a factor of 10, what happens to the pH of the solution?
increases by 1
A NaOH(aq) solution and an acid-base indicator are used to determine the molarity of an HCl(aq) solution. A 15.0-milliliter sample of the HCl(aq) is exactly neutralized by 30.0 milliliters of 0.010 M NaOH(aq).
Based on Table M, state the color of litmus when placed in a sample of the original HCl(aq) solution. [
red
Which substance or substances below would react with Magnesium.
a) HCl
b) H2CO3
c) NH3
d) NaOH
a) HCl
b) H2CO3
A NaOH(aq) solution and an acid-base indicator are used to determine the molarity of an HCl(aq) solution. A 15.0-milliliter sample of the HCl(aq) is exactly neutralized by 30.0 milliliters of 0.010 M NaOH(aq).
Using the titration data, determine the concentration of the HCl(aq) solution
0.020 M
HCl + H2O --> H3O+ + Cl-
The water molecule acts as a base because it
a. donates H+
b. accepts H+
c. Donates OH-
d. Accepts OH-
b. accepts H+
What is the pH value of an aqueous solution with a hydronium ion concentration 1000 times greater than an aqueous solution with a pH value of 5.0?
2
Which indicator is blue in a solution that has a pH value of 7.0?
(1) bromcresol green
(2) phenolphthalein
(3) methyl orange
(4) thymol blue
(1) bromcresol green
Based on Table J, which metal will react spontaneously with Fe2+(aq) ions?
(1) copper (3) magnesium (2) gold (4) silver
Magnesium
A 30.0-milliliter sample of HCl(aq) was exactly neutralized by 18.0 milliliters of 0.10 M KOH(aq).
Determine the concentration of the HCl(aq) sample, using the titration data.
0.060 M
Which substance is an Arrhenius Base?
a. HNO3
b. H2SO3
c. Ca(OH)2
d. CH3COOH
c. Ca(OH)2
During a laboratory activity, a student places 20.0 mL of HCl(aq) of unknown concentration into a flask. The solution is titrated with 0.10 M KOH(aq) until the HCl(aq) is exactly neutralized. At the end of the titration, the volume of KOH(aq) added is 42.0 mL.
Compare the number of moles of H+(aq) ions to the number of moles of OH-(aq) ions in the titration mixture when the HCl(aq) is exactly neutralized by the KOH(aq).
equal
Addition of the indicator methyl orange to an unknown solution leads to a yellow color. The addition of bromthymol blue to the same solution also leads to a yellow color.
(a) Is the solution acidic, neutral, or basic?
(b) What is the range (in whole numbers) of possible pH values for the solution?
Acidic
4-6
Write the balanced neutralization reaction for potassium hydroxide and sulfuric acid.
H2SO4 (aq) + 2KOH (aq) --> K2SO4 (aq) + 2H2O (l)
How many milliliters of 1 M HCl must be diluted with water to make exactly 500 mL of 0.1 M HCl?
50 mL
Given the equation representing an equilibrium:
HSO4- + H2O <--> H3O+ + SO42-
Which two formulas represent the H+ acceptors in this equilibrium?
H2O and SO42-
Bonus: Hydrogen acceptors are _______