Acids, Bases, Salts and pH Calculations

A solution with a pH of 7 is________

• increasing
• neutral
• decreasing
• apple juice

HCl is a __________.

• Weak acid
• Strong acid
• Weak base
• Strong base
• Neutral

Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue.
The substance in the beaker

• is a base.
• has a neutral pH.
  
• is an acid.
• does not have a pH.

Which compound is the conjugate acid? (Hint: Determine the base)

PO₄^3- + HNO₃ ==> NO₃^- + HPO₄^2-

• PO₄^3-

• HNO₃

• NO₃^-

• HPO₄^2-

In the reaction below, H₂O is a(n):

H₂SO₃ + H₂O --> H₃O⁺ + HSO₃^-

• base

• acid

• conjugate acid

• conjugate base

HSO₄^- + H₂O → H₃O⁺+ SO₄^2-
Identify the Acid in the above reaction.

• HSO₄^-
• H₂O
• H₃O⁺
• SO₄^2-

CO₃^2-(aq)+H₂O(l)      →              HCO₃^-(aq)+OH^-(aq)
Using the above reaction, which compound is the conjugate base?

• CO₃^2-
• H₂O
• HCO₃^-
• OH^-

A solution of HCl has a [H⁺] = 7.2 x 10^-9. Is this and acid or a base?

• Acid

• Base

KOH has a pOH of 3.0, what is the [OH^-]?

• 0.01 M

• 0.001 M

• 0.0001 M

• 0.1 M

What is the pOH of a solution with and [OH^-] = 4.5 x 10^-4?

• 3.53

• 3.80

• 3.35

• 5.33