Salty Situations
A salt solution of NaA can be neutral or _______.
What is basic?
This type of Lewis compound accepts a lone pair of electrons.
One of the following is more acidic: H2O and H2S.
What is H2S?
As the strength of an acid increases, the strength of its conjugate base _________.
What is decreases?
According to the common-ion effect, the percent ionization of a weak electrolyte can be decreased by doing this.
What is adding a strong electrolyte containing a common ion?
This is the pH of a 1.4 M solution of Ba(NO3)2 at 25 oC.
What is pH 7?
A Bronsted-Lowry base is always considered a Lewis base. (True/False)
What is true?
One of the following is more acidic: HOCl, HOBr, and HOI.
What is HOCl?
This is the quantitative relationship between Ka and Kb for conjugate acid-base pairs.
What is Ka x Kb = Kw?
This quantitative relationship allowing for the calculation of pH from concentrations of a conjugate acid-base pair is known as the Henderson-Hasselbach equation.
What is pH = pKa + log [base]/[acid]?
Fe3+ is ______ (more/less) acidic than Fe2+.
What is more?
A Lewis base is always considered a Bronsted-Lowry base. (True/False)
What is False?
Arrange the following acids in order of increasing acid strength: H2SO4, H2SeO3, and H2SeO4.
What is H2SeO3 < H2SeO4 < H2SO4?
We can calculate Kb for this compound if we know the value of Ka for HCO3-.
What is CO32-?
This is an example of a salt that can decrease the ionization of HNO2 in solution.
What is MNO2?
One of these salts is unlike the others: Ba(CH3COO)2, NH4Cl, CH3NH3Br, Al(ClO4)3.
What is Ba(CH3COO)2?
Identify the Lewis acid and base among the reactants:
Fe(ClO4)3(s) + 6 H2O(l) <=> Fe(H2O)63+(aq) + 3 ClO4-(aq)
What is the Lewis acid is Fe(ClO4)3 or Fe3+ and the Lewis base is H2O?
This is the reason why HF is a weak acid even though it has the most polar H-X bond.
What is bond strength?
This is the Kb of F- given Ka of HF is 6.8 x 10-4.
What is Kb = 1.5 x 10-11?
This describes the effect on pH after adding 25 mL of a 1.0 M NaCl solution to a 25 m solution of 1.0 M HOCl.
What is pH increases?
One of these salts is more acidic than the other: NH4NO2 and NH4NO3.
What is NH4NO3?
CO2 and H2O react to form H2CO3. CO2 acts as this type of Lewis compound in this reaction.
Lewis acid
Arrange the following in order of increasing acid strength: AsH3, HBr, KH, H2Se.
What is KH < AsH3 < H2Se < HBr?
One of the following has the stronger conjugate base: CH3COOH (Ka = 1.8 x 10-5) and HOCl (Ka = 3.0 x 10-8).
What is HOCl?
This is the pH of a buffer that is 0.12 M in lactic acid (Ka = 1.4 x 10-4) and 0.10 M in sodium lactate.
What is pH 3.77?