What is the conjugate base of HClO₄?

• H⁺

• Cl^-

• ClO₃^-

• ClO₄^-

Which is a strong acid?

• 12.0M HNO₂

• 10.0M H₂SO₃

• 5.0M HI

• 5.0M HF

What is the closest pH to a solution with a [H⁺] = 2.5 x 10^-10?

• 2.5

• 3.0

• 4

• 9

The [OH^-] = 4.0 x 10^-9, what is the pH of the solution?

• 9.0

• 5.7

• 8.3

• 4.3

Which acid produces the strongest conjugate base?

• HClO₄ (Ka= 1.0 x 10⁷)

• HCN (Ka= 4.0 x 10^-10)

• H₃PO₄ (Ka= 7.5 x 10^-3)

• H₂CO₃ (Ka = 4.2 x 10^-7)

Tags

NGSS.HS-PS1-1

Which salt will form an acidic solution?

• NH₄Cl

• NaCl

• NaHCO₃

• BaCl₂

Which represents an acid with the smallest Ka value?

• HX

• HY

• HZ

When citric acid is produced by the cells of an orange and dissolves in water, it produces a relatively small number of hydronium ions. Citric acid is best described as a

• concentrated acid. 
• weak acid. 
• dilute acid.
• strong acid.

WHen 200 mL of 2.0 M NaOH(aq) is added to 500 mL of 1.0 M HCl(aq), the pH of the resulting mixture is closest to 

• 1.0
• 3.0
• 7.0
• 13.0

A solution contains 0.04 M of a weak acid. Calculate the pH of the solution knowing that the K_a for the acid is 1.6 x 10^-7

• It is not possible to solve if the identity of the acid is not known

• 4.1

• 4.9

• Because the Ka is very small, the pH is close to neutral (about 6)