Altering Solubility and Qualitative Analysis

• adding BaS_(s) 

• adding Na₂SO_3(s) 

• adding BaSO_3(s)

• adding water

Which of the following describes the changes in ion concentrations when 1.0 g of solid ZnS is added to a saturated solution of ZnS?

• [Zn⁺²] decreases and [S^-2] decreases

• Both [Zn⁺²] and [S^-2] remain constant

• [Zn⁺²] increases and [S^-2]  

  increases

• [Zn⁺²] increases and [S^-2] decreases

What occurs when 0.50 M of Pb(NO₃)₂ is added to a saturated solution of PbI₂? 

• Ksp value increases

• The solubility of PbI₂ increases

• The [I^-] increases

• The mass of the solid increases

What will be the effect of adding some solid Cu(NO₃)₂ to a saturated solution of AgCl?

• More AgCl will be produced

• The Cu(NO₃)₂ will not dissolve

• More AgCl will dissolve

• The Cu(NO₃)₂ will not affect the AgCl equilibrium

• Equilibrium - shifts left

  [SO₄^-2] - decreases

• Equilibrium - shifts right

  [SO₄^-2] - decreases

• Equilibrium - shifts right

  [SO₄^-2] - increases

• Equilibrium - shifts left

  [SO₄^-2] - increases

Which of the following in true when solid NaOH is added to a saturated solution of CuS and equilibrium is re-established?

• [S^-2] increases

• [S^-2] does not change

• [Cu⁺²] increases

• [Cu⁺²] does not change

Which of the following could dissolve a precipitate of CaC₂O₄ in a saturated solution of CaC₂O₄?

• CaC₂O₄

• H₂C₂O₄

• Ca(NO₃)₂

• NaOH

Identify the group of cations that can be precipitated from solution by hydrobromic acid, HBr.

• Ag⁺, Zn⁺², Hg²⁺

• Pb⁺², Zn⁺², Hg²⁺

• Cu⁺, Pb⁺², Ag⁺

• Ag⁺, Pb⁺², Cu²⁺

What two ions make water "hard"?

• Mg²⁺ and Cu²⁺

• Mg²⁺ and Ca²⁺

• Pb²⁺ and Cu²⁺

• Pb²⁺ and Ca²⁺

To remove Mg²⁺ from a solution by precipitation, a student should add...

• Li₂SO₄

• (NH₄)₂S

• NaI

• KOH