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Worksheet: Buffer pH

Q1:

A buffer solution is prepared from equal volumes of 0.200 M acetic acid and 0.600 M sodium acetate. The 𝐾 a of acetic acid is 1 . 8 0 × 1 0 5 .

Is the solution acidic, neutral, or basic?

  • ABasic
  • BNeutral
  • CAcidic

Q2:

Saccharin, C H N S O H 7 4 3 , is a weak acid ( 𝐾 = 2 . 1 0 × 1 0 a 2 ). If a 0.250 L solution with a buffered pH of 5.48 is prepared from 2 . 0 0 × 1 0 3 g of sodium saccharide, N a ( C H N S O ) 7 4 3 , what is the equilibrium concentration of saccharin in the solution?

  • A 8 . 1 6 × 1 0 7 M
  • B 3 . 9 0 × 1 0 5 M
  • C 1 . 0 2 × 1 0 8 M
  • D 6 . 1 5 × 1 0 9 M
  • E 5 . 6 9 × 1 0 2 M

Q3:

A 0.500 L aqueous buffer solution is prepared from 0 . 1 6 5 m o l H P O 3 4 and 0 . 2 3 0 m o l K H P O 2 4 . The 𝐾 a of H P O 3 4 is 7 . 5 × 1 0 2 and the self-ionization constant of water, 𝐾 w , is 1 . 0 × 1 0 1 4 . Assuming that H P O 3 4 behaves as a monoprotic acid, calculate to 1 decimal place the pH of the buffer solution.

Q4:

Consider the equilibrium

What is [ H O ] 3 + in a solution of 0 . 2 5 M C H C O H 3 2 and 0 . 0 3 0 M C H C O N a 3 2 ?

  • A 8 . 1 × 1 0 9 M
  • B 2 . 2 × 1 0 6 M
  • C 1 . 8 × 1 0 5 M
  • D 1 . 5 × 1 0 4 M
  • E 6 . 2 × 1 0 5 M