Exam 2
What is the pH when the [H+]=2.51e-11
10.6
What is the [OH-] when the pH=8.4?
2.5e-6M
What is the Ka when the pKa is -1.4?
25
What is the pH when the [OH-]=2.51e-11?
3.40
What is the pKa when the Ka=1.8e-5?
4.7
What is the pH when the [H+]=3.98e-6?
5.40
What is the pOH when the [H+]=3.98e-6
8.60
Which of the following compounds is the strongest Bronsted base? CH3-, NH2-, OH-, F-
CH3-
Which of the following compounds is the strongest Bronsted base? H2PO4-, HSO4-, NO3-, CH3COO-
CH3COO-
Which of the following compounds is the strongest Bronsted acid? CH4, NH3, H2O, HF
HF
Which Bronsted acid (H2O or H2S(aq)) is the stronger acid and why?
H2S is the stronger acid because there is a longer bond length between the sulfur and hydrogen.
Which of the following compounds is the strongest Bronsted acid? H3PO4, H2SO4, HNO3, CH3COOH
H2SO4
Which Bronsted acid (HCl or H2S(aq)) is the stronger acid and why?
HCl is the stronger acid because chlorine has a greater electronegativity than sulfur.
Which of the following is the strongest Bronsted base? NaCH3, NaOH, NaF, NaNH2
NaCH3
Base...
conjugate acid
Acid...
conjugate base
pKa decreases,
down the periodic table
Ka>1 when
products occur in the majority
Ka<1 when
reactants occur in the majority
The lower the pKa,
the stronger the acid.