Solubility Guidelines and Predicting precipitates Chem 1

1
Solubility Guidelinesand Predicting precipitates

• Chem 12
• Mrs. Kay

2
Solubility Guidelines

• Summary of ionic-compounds interactions with
  water
• The table breaks down the ionic compound into
  cation and anions and describes its level of
  solubility.
• If it is soluble it will completely break up into
  its ions.
• If it is insoluble it will not break up into
  ions, but remain the same compound.

3
(No Transcript)
4
Practice

• Using your solubility tables from your data
  booklets, tell me if the following compounds
  will break up in water, or remain the same.
• PbCl2
• ZnO
• AgCH3COO
• KNO3
• CaCO3
• AlPO4
• AgCl

• ZnCO3
• FeSO4
• MgCl2
• CaS

5
Mix two aqueous ionic compounds

• Two possibilities
• Compounds will remain in solution without
  reacting
• Compounds will react with one another, producing
  new products.
• HOW CAN YOU TELL WHAT WILL HAPPEN?

6
Double Displacement Reactions

• WX YZ ? WZ YX
• You know its happened if
• Forms a precipitate (ions makes an insoluble
  solid)
• Forms a gas (ions make a gas product)
• Forms water (H and OH- combine)

7
In other words

• If all the reactants are soluble, even after a
  replacement has occurred and you have not formed
  a precipitate, a gas, or water, then no reaction
  has occurred.
• It would look like
• NH4Cl ZnSO4 ? NR
• NH4 Cl- Zn2 SO4-2 ? when combined it
  only makes soluble compounds, so no reaction

8

• Balanced Equation
• AgNO3(aq) NaCl(aq) ? AgCl(s) NaNO3(aq)
• Ionic Equation (soluble compounds break up into
  ions, otherwise stay the same)
• Ag(aq) NO3-(aq) Na(aq) Cl-(aq) ? AgCl(s)
  Na(aq) NO3-(aq)
• Net Ionic Equation cancel out spectator ions
  (ones that are the same on both sides)
• Ag(aq) Cl-(aq) ? AgCl(s)

9
Practice

• Pg 290 4
• Pg 294 5-6