AP Acids and Bases Review

In which of the following aqueous solutions does the weak acid exhibit the highest percentge of ionization?

• .01 M HC₂H₃O₂ . (K_a 1.8 x 10 ^-5)

• .01 M HNO₂ . ( K_a =4.5 x 10 ^-4)

• .01 M HClO . (K_a= 3.0 x 10 ^-8)

• .01 M HF (K_a= 6.8 x 10 ^-4)

A 0.10 M solution of ______ will have a pH of 7.00.

• NaNO₃

• KF

• Na₂S

• NaF

Z is a weak base. An aqueous solution of Z is prepared by dissolving 0.35 mol of Z in sufficient water to yield 1.0 L of solution. The pH of the solution was 8.93 at 25.0 ⁰C. What is the K_b of the solution

• 1.2 x 10^-5

• 6.9 x 10 ^-9

• 2.1 x 10 ^-10

• 2.8 x 10 ^-12

Which is the strongest acid?

• H₂S

• H₂Se

• H₃P

• H₂Te

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What will be the pH if this salt is added to water:

CH₃CH₂NH₃NO₃

• pH = 7

• pH > 7

• pH < 7

What will be the pH if this salt is added to water:

NH₄Cl

• pH = 7

• pH > 7

• pH < 7

What can be added to a solution of HCOOH to make a buffer solution?

I - HCl

II - NaOH

III - NaHCOO

• I only

• II only

• III only

• I or III

• II or III

A buffer solution is made from lactic acid (pK_a = 3.86) and sodium lactate. At a pH of 2, which is true?

• [HC₃H₅O₃] > [NaC₃H₅O₃]

• [HC₃H₅O₃] ~= [NaC₃H₅O₃]

• [HC₃H₅O₃] < [NaC₃H₅O₃]

A weak base is titrated with a strong acid. At the half equivalence point, which species exist?

• Just the weak base

• The weak base, a small amount of its conjugate, and OH^-

• Equal moles of weak base and its conjugate

• Just the conjugate

• The conjugate, a small amount of the weak base, and H⁺

If it takes 54.0 mL of 0.100 M NaOH to neutralize 125 mL of an HCl solution, what is the concentration of HCl?

• 0.0432 M

• 23.15 M

• 0.231 M

• 0.100 M