Unit 5 Review quiz Physical Science

What would the conjugate acid of H₂O? (water acting like a base)

• OH^-

• H₃O⁺

• H⁺

What would the conjugate base of HCO₃^- be?

• H₂CO₃

• CO₃^2-

• H₂CO3^-

• CO₃^-

Select all that apply to all acidic solutions:

• have a higher [H₃O⁺] than [OH^-]

• have a pH lower than 7

• turn litmus paper blue

• conduct electricity

What is the pH of a solution with [H₃O⁺] = 1.0 x 10^-9?

(remember, pH = -log[H₃O⁺]

• 2

• 7

• 9

• -9

• -2

In the reaction below, H₂O is a(n):

H₂SO₃ + H₂O --> H₃O⁺ + HSO₃^-

• base

• acid

• conjugate acid

• conjugate base

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

PO₄^3- + HNO₃ ==> NO₃^- + HPO₄^2-

• PO₄^3-

• HNO₃

• NO₃^-

• HPO₄^2-

The conjugate base of H₂SO₄ is ___.

• H₂SO₃

• HSO₄^-

• H₃SO₄⁺

• SO₄^-2

In the reaction represented by  $H_2C_2O_4+CH_3NH_2\ \ \rightarrow\ \ HC_2O_4^-+CH_3NH_3^+,$   Which of these is a conjugate acid to the base  $CH_3NH_2$ ?

• None

•  $H_2C_2O_4$  

•  $CH_2NH_3^+$  

•  $HC_2O_4^-$  

What is the pH of a solution with a hydrogen ion concentration of 1.0 x 10^-8 M?

(HINT...pH = -log [H⁺] )

• -8

• 6

• 8

• 14

What is the pH of a 0.0001 M HCl solution

• 1

• 4

• 7

• 11