NaNO3
Neutral
BH3 + (CH3)2S → H3BS(CH3)2
Acid BH3
Base (CH3)2S
Write out the Stepwise Ka reactions for citric acid H3C6H5O7
H3C6H5O7 + H2O ⇌ H2C6H5O7- + H3O+ Ka1
H2C6H5O7- +H2O ⇌ HC6H5O72- + H3O+ Ka2
HC6H5O72- + H2O ⇌ C6H5O73- + H3O+ Ka3
Calculate the pH of a 1.30 x 10¯9 M of HBr solution
6.99
Consider a buffer made by adding 132.8 g of NaC₇H₅O₂ to 300.0 mL of 2.31 M HC₇H₅O₂ (Ka = 6.3 x 10⁻⁵) What is the pH of this buffer?
4.32
C5H5NHClO4
Acidic
CaO + CO2 → CaCO3
Acid CO2
Base CaO
Equilibrium formed when C5H5N is added to water?
C5H5N + H2O ⇌ C5H6N+ + OH-
A solution is prepared by dissolving 0.56 g of Benzoic acid (C6H5COOH, Ka=6.4 x 10-5, Molar Mass = 122.12 g/mol) in 1 L of water. Calculate pH
pH = 3.27
It takes 83 mL of a 0.45 M NaOH solution to neutralize 235 mL of an HCl solution. What
is the concentration of the HCl solution?
0.16 M HCl
KOCl
Basic
Cd(CN)2+2CN-→Cd(CN)2+4
Acid Cd(CN)2
Base CN-
CH3COOH + H2O ⇌ CH3COO- + H3O+
What will increase the pH of the solution?
A) Increasing the pKa
B) Increasing Acetic acid concentration
C) Adding Sodium Acetate
D)Decreasing the Volume of H2O
C) Adding Sodium Acetate
Calculate the percent Dissociation for a 0.22 M solution of Chlorous acid (Ka=1.2x10-2)
about 23%
Determine the pH of a buffer that is 0.25 M NH₃ and 0.15 M NH₄Cl. The value of pKb for NH₃ is 4.75
9.47
NH4NO2
Kb for NH3 is 1.8 x 10-5
Ka for HNO2 is 4.0 x 10-4
Acidic
Would you expect Fe3+ or Fe2+ to be the stronger lewis acid?
Fe3+
Which of the following will increase the percentof NH3 that is converted to the ammonium ion in water?
A.) addition of NaOH
B.) addition of HCl
C.) addition of NH4Cl
B.) addition of HCl
A solution of Formic acid (HCOOH, Ka = 1.8 x 10-4, Molar Mass = 46.03 g/mol) has a pH of 2.70. Calculate initial concentration of formic acid in this solution. If I used this concentration to make 550 mL of solution, how many grams of formic acid would I need?
[HCOOH]0=0.024
I need 0.608 g
What volume in mL of a 0.244 M solution of the strong acid HCl must be added to completely neutralize 75.0 mL of a 0.182 M solution of the strong base NaOH?
55.94 mL
C6H5NH3ClO2
Kb for Aniline is 3.8 x 10-10
Ka for Chlorous Acid is 1.2 x 10-2
Acidic
Aluminum Hydroxide is an amphoteric substance. It fits the definition of lewis acid and base. Write a reaction showing Al(OH)3 acting as a base and acid?
Acid: Al(OH)3 +3H+ ---> Al3+ + 3H2O
Base: Al(OH)3 + OH- ---> Al(OH)4-
Label All substances in the reaction
Al(H2O)63+ + H2O ⇌ H3O+ + Al(H2O)5(OH)2+
Acid Al(H2O)63+
Base H2O
Conjugate Base Al(H2O)5(OH)2+
Conjugate Acid H3O+
I dissolve 8.96 g of NaN3 in 675 mL of water. What is the pH. (Ka for HN3 is 1.9 x 10-5, molar mass = 65.01 g/mol)
pH = 9.02
What is the effective pH range for an acetic acid (Ka=1.8 10-5) and sodium acetate buffer System.
3.74-5.74