chem exam 3

What is the reaction that is most likely to happen when KOH is added to a buffer solution consisting of equal molar amounts of benzoic acid (HC₇H₅O₂) and benzoate (C₇H₅O₂^-)?

HC7H5O2 + KOH ←> C7H5O2 +H2O

buffer removes KOH since its a stronger acid and replaces it with benzoate and water

How does the percent ionization of a strong acid in water compare to that of a weak acid in water?

Strong acids have a 100% ionization in water, whereas weak acids have a much smaller percent ionization.

In the context of the reaction between ammonia (NH₃) and acetic acid (CH₃COOH)

Ammonia can be considered . . . (select all that apply)

a Brønsted-Lowry base (proton acceptor) and a Lewis base ( electron pair donor)

What are the products for reaction between HBr and HCO₃^-?

H2CO3 + Br

Using an ICE table, find the pH of a 0.450 M lactic acid (HC₃H₅O₃) solution. The K_a of lactic acid is 1.4 x 10^-4

-log(sqrt(0.450)(1.4 × 10 ^-4)) = 2.10

What is the pH of a 0.125 M NaOH solution?

log ( 0.125) =-0.903 = 14.00 - 0.903 =13.097

How does the dissociation of NaOH in water compare to the dissociation of methylamine (CH₃NH₂), a weak base?

NaOH completely dissociates in water whereas methylamine only partially dissociates in water

How many steps are there in the ionization of the phosphoric acid in water?

3

is triprotic meaning there’s three ionizable hydrogen atoms

For the acid-base reaction between carbonate (CO₃^-) and water (H₂O), identify the Brønsted-Lowry acid

H2O

For the acid-base reaction between carbonate (CO₃^-) and water (H₂O), identify the Brønsted-Lowry base

CO3

For the acid-base reaction between carbonate (CO₃^-) and water (H₂O), identify the conjugate acid

HCO3

For the acid-base reaction between carbonate (CO₃^-) and water (H₂O), identify the conjugate base

OH-