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Worksheet: Acid and Base Strengths

Q1:

A solution has a H C l concentration of 0.10 M and a formic acid ( H C O O H ) concentration of 0.10 M. Why is the hydronium ion concentration in this solution mainly determined by the concentration of H C l ?

  • A H C l reacts with H C O O H , neutralizing it.
  • B H C O O H does not dissociate at all, so H C l is the only contributor to [ H ] + .
  • C H C O O H dissociates to form both hydroxide and hydronium ions, so has no net effect on [ H ] + .
  • D H C l dissociates completely, while H C O O H only partially dissociates.

Q2:

Which one out of B r O , B r O 2 , B r O 3 , and B r O 4 is the strongest base?

  • A B r O 2
  • B B r O
  • C B r O 3
  • D B r O 4
  • EThey are all equally strong bases.

Q3:

Of the compounds H O C l , H O B r , and H O I , which is the strongest acid?

  • A H O I
  • B H O B r
  • CThey are all equally strong acids.
  • D H O C l

Q4:

Aniline ( C H N H ) 6 5 2 is a much weaker base than ammonia ( N H ) 3 . If the initial concentrations of ammonia and aniline in a solution are both equal to 0.10 M, which of the following statements is true at equilibrium?

  • A [ O H ] = [ C H N H ] 6 5 3 +
  • B [ N H ] = [ C H N H ] 4 + 6 5 3 +
  • C [ N H ] = [ C H N H ] 3 6 5 2
  • D [ O H ] = [ N H ] 4 +
  • E [ O H ] = [ C H N H ] 6 5 2

Q5:

Which one out of N a H S O 3 , N a H S e O 3 , and N a H S O 4 is the strongest acid?

  • A N a H S O 3
  • B N a H S e O 3
  • CThey are all salts and therefore are not acidic.
  • D N a H S O 4
  • EThey are all equally strong acids.

Q6:

Which one out of H O C l , H O - , H O - , and H O - is the strongest acid?

  • A H O -
  • B H O C l
  • C H O -
  • D H O -
  • EThey are all equally strong acids.

Q7:

Which one out of N H 2 , H S , H T e , and P H 2 is the strongest base?

  • A H T e
  • B H S
  • C P H 2
  • D N H 2
  • EThey are all equally strong bases.

Q8:

Of the following ions, which is the strongest Brønsted-Lowry base?

  • A N O 3
  • B C l
  • C H S O 4
  • D F
  • E B r

Q9:

Which one out of B r O 2 , C l O 2 , and I O 2 is the strongest base?

  • A C l O 2
  • B B r O 2
  • CThey are all equally strong bases.
  • D I O 2

Q10:

Which conjugate acid, ( C H ) N H 3 2 2 + or ( C H ) N H 3 2 3 + , is the stronger acid at 2 5 C ? 𝐾 = 4 . 4 × 1 0 b 3 2 ( C H N H ) 4 and 𝐾 = 5 . 9 × 1 0 b 3 2 ( ( C H ) N H ) 4 .

  • AThey are both ammonium ions, and therefore they are equally strong acids.
  • B ( C H ) N H 3 2 2 +
  • CIt is impossible to tell without knowing at what concentrations the acidities of the compounds are measured.
  • D ( C H ) N H 3 2 3 +