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Worksheet: Common Ion Effects

Q1:

What is the concentration of sulfate ions when B a S O 4 just begins to precipitate from a solution that is 0.0758 M in ? The 𝐾 s p of B a S O 4 is 2 . 3 0 Γ— 1 0 βˆ’ 8 .

  • A 2 . 3 0 Γ— 1 0 βˆ’ 8 M
  • B 0.0758 M
  • C 6 . 0 7 Γ— 1 0 βˆ’ 7 M
  • D 3 . 0 3 Γ— 1 0 βˆ’ 7 M
  • E 1 . 2 1 Γ— 1 0 βˆ’ 6 M

Q2:

A solution contains all of the following carbonates at the same concentration. If [ C O ] 3 2 – is gradually increased, which carbonate is last to precipitate?

  • A C a C O 3 ( 𝐾 = 4 . 2 Γ— 1 0 ) s p βˆ’ 7
  • B M g C O 3 ( 𝐾 = 3 . 5 Γ— 1 0 ) s p βˆ’ 8
  • C M n C O 3 ( 𝐾 = 5 . 1 Γ— 1 0 ) s p βˆ’ 9
  • D B a C O 3 ( 𝐾 = 4 . 4 Γ— 1 0 ) s p βˆ’ 5
  • E S r C O 3 ( 𝐾 = 3 . 9 Γ— 1 0 ) s p βˆ’ 9

Q3:

A solution contains 0.010 M of both C u 2 + and C d 2 + . Sulfide ions are added to the solution until 99.9% of the C u 2 + ions have been precipitated as C u S . Calculate the percentage of C d 2 + ions remaining in solution. The 𝐾 s p value C u S is 8 . 5 Γ— 1 0 βˆ’ 4 5 and that of C d S is 1 . 0 Γ— 1 0 βˆ’ 2 8 .

Q4:

For 0.500 L of a solution containing 19.50 g of K S O 2 4 in contact with solid A g S O 2 4 , what is [ A g ] + at equilibrium? The 𝐾 s p of A g S O 2 4 is 1 . 2 Γ— 1 0   .

  • A 6 . 4 Γ— 1 0  οŠͺ M
  • B 1 . 4 Γ— 1 0   M
  • C 7 . 4 Γ— 1 0  οŠͺ M
  • D 7 . 4 Γ— 1 0   M
  • E 1 . 3 Γ— 1 0  οŠͺ M

Q5:

The solubility product of C a S O Β· 2 H O 4 2 is 2 . 4 Γ— 1 0 βˆ’ 5 . What mass of this salt will dissolve in 1.0 L of a solution with a S O 4 2 – concentration of 0.010 M?

Q6:

A solution contains all of the following carbonates at the same concentration. If [ C O ] 3 2 – is gradually increased, which carbonate is first to precipitate?

  • A C a C O 3 ( 𝐾 = 4 . 2 Γ— 1 0 ) s p βˆ’ 7
  • B M g C O 3 ( 𝐾 = 3 . 5 Γ— 1 0 ) s p βˆ’ 8
  • C M n C O 3 ( 𝐾 = 5 . 1 Γ— 1 0 ) s p βˆ’ 9
  • D S r C O 3 ( 𝐾 = 3 . 9 Γ— 1 0 ) s p βˆ’ 9
  • E B a C O 3 ( 𝐾 = 4 . 4 Γ— 1 0 ) s p βˆ’ 5

Q7:

In a solution of 0 . 0 2 5 M N a C l in contact with solid A g C l , what is [ A g ] + at equilibrium? The 𝐾 s p of A g C l is 1 . 6 Γ— 1 0 βˆ’ 1 0 .

  • A 1 . 6 Γ— 1 0 βˆ’ 9 M
  • B 7 . 9 Γ— 1 0 βˆ’ 8 M
  • C 5 . 1 Γ— 1 0 βˆ’ 8 M
  • D 6 . 4 Γ— 1 0 βˆ’ 9 M
  • E 4 . 0 Γ— 1 0 βˆ’ 7 M

Q8:

What is the concentration of S r 2 + when S r F 2 starts to precipitate from a solution that is 0.0035 M in F – ? The 𝐾 s p of S r F 2 is 4 . 3 Γ— 1 0 βˆ’ 9 .

  • A 4 . 5 Γ— 1 0 βˆ’ 5 M
  • B 1 . 2 Γ— 1 0 βˆ’ 6 M
  • C 5 . 2 Γ— 1 0 βˆ’ 5 M
  • D 3 . 5 Γ— 1 0 βˆ’ 4 M
  • E 3 . 0 Γ— 1 0 βˆ’ 5 M

Q9:

In a solution of 0.025 M  T l N O 3 in contact with solid T l C l , what is [ C l ] – at equilibrium? The 𝐾 s p of T l C l is 1 . 7 Γ— 1 0 βˆ’ 4 .

  • A 4 . 8 Γ— 1 0 βˆ’ 4 M
  • B 6 . 8 Γ— 1 0 βˆ’ 3 M
  • C 4 . 3 Γ— 1 0 βˆ’ 3 M
  • D 5 . 6 Γ— 1 0 βˆ’ 3 M
  • E 6 . 0 Γ— 1 0 βˆ’ 4 M

Q10:

In a solution of 0 . 0 3 1 3 M K F in contact with solid B a F 2 , what is [ B a ] 2 + at equilibrium? The 𝐾 s p of B a F 2 is 1 . 8 4 Γ— 1 0 βˆ’ 7 .

  • A 1 . 7 3 Γ— 1 0 βˆ’ 4 M
  • B 2 . 0 1 Γ— 1 0 βˆ’ 4 M
  • C 1 . 5 9 Γ— 1 0 βˆ’ 3 M
  • D 1 . 8 8 Γ— 1 0 βˆ’ 4 M
  • E 6 . 5 0 Γ— 1 0 βˆ’ 3 M

Q11:

In 2.250 L of solution containing 8.156 g of M g ( N O ) 3 2 in contact with solid M g C O 2 4 , what is [ C O ] 2 4 2 – at equilibrium? The 𝐾 s p of M g C O 2 4 is 7 . 0 Γ— 1 0 βˆ’ 7 .

  • A 7 . 2 Γ— 1 0 βˆ’ 4 M
  • B 3 . 1 Γ— 1 0 βˆ’ 6 M
  • C 6 . 4 Γ— 1 0 βˆ’ 4 M
  • D 2 . 9 Γ— 1 0 βˆ’ 5 M
  • E 8 . 0 Γ— 1 0 βˆ’ 2 M

Q12:

What is the concentration of P O 4 3 – when A g P O 3 4 starts to precipitate from a solution with an A g + concentration of 0.0125 M? The 𝐾 s p of A g P O 3 4 is 1 . 8 Γ— 1 0 βˆ’ 1 8 .

  • A 1 . 4 Γ— 1 0 βˆ’ 1 6 M
  • B 1 . 2 Γ— 1 0 βˆ’ 1 4 M
  • C 3 . 0 Γ— 1 0 βˆ’ 1 5 M
  • D 9 . 2 Γ— 1 0 βˆ’ 1 3 M
  • E 2 . 3 Γ— 1 0 βˆ’ 1 5 M

Q13:

A sample of C o C O 3 ( 𝐾 = 1 . 0 Γ— 1 0 s p βˆ’ 1 2 ) is contaminated with 0.1 g of N i C O 3 ( 𝐾 = 1 . 3 6 Γ— 1 0 s p βˆ’ 7 ). The sample is treated with the minimum amount of water required to completely dissolve the N i C O 3 . Noting that the two carbonate salts dissolve in the same volume of water, calculate the mass of C o C O 3 that is also washed away.

  • A 1 Γ— 1 0 βˆ’ 1 0 g
  • B 5 Γ— 1 0 βˆ’ 5 g
  • C 4 Γ— 1 0 βˆ’ 7 g
  • D 7 Γ— 1 0 βˆ’ 7 g
  • E 6 Γ— 1 0 βˆ’ 1 0 g

Q14:

In a 0.00133 M solution of K F in contact with solid C a F 2 , what is [ C a ] 2 + at equilibrium? The 𝐾 s p of C a F 2 is 4 . 0 Γ— 1 0 βˆ’ 1 1 .

  • A 1 . 3 Γ— 1 0 βˆ’ 5 M
  • B 4 . 4 Γ— 1 0 βˆ’ 6 M
  • C 5 . 1 Γ— 1 0 βˆ’ 5 M
  • D 2 . 3 Γ— 1 0 βˆ’ 5 M
  • E 1 . 2 Γ— 1 0 βˆ’ 6 M

Q15:

How many grams of P b ( O H ) 2 ( 𝐾 = 1 . 2 Γ— 1 0 ) s p    will dissolve in 500 mL of a 0 . 0 5 0 M P b C l 2 solution?

  • A 8 . 1 Γ— 1 0   g
  • B 4 . 8 Γ— 1 0   g
  • C 0.16 g
  • D 9 . 3 Γ— 1 0   g
  • E 1 . 2 Γ— 1 0    g