Exam W 10/28. Review T 10/27 1 pm SL 150. Happy Mole Day!. Precipitation. Solubility. Soluble = ability to dissolve in a liquid Insoluble = inability to dissolve in a liquid Not all Ionic Compounds are water soluble Not all molecular compounds are insoluble!.
Review T 10/27 1 pm SL 150
(Taken from Cornell University – Adapted by Daley – Sing to Rhythm of 99 Bottles)
Potassium, sodium, and ammonium salts, Whatever they may be, Can always be depended on For solubility. Asked about the nitrates or acetates The answer is always clear, They each and all are soluble, Is all we want to hear.
Most every chloride's soluble At least we've always read Save silver, mercurous mercury And (slightly) chloride of lead.
Take the Bromide and iodide salts There soluble as can be Save silver, mercury, and lead That precipitate as you see
Every single sulfate
Is soluble , 'Tis said
'Cept barium and strontium And calcium and lead.
Hydroxides of metals won't dissolve That is, all but three Potassium, sodium and ammonium Dissolve quite readily.
And then you must remember That you must not "forgit" Calcium, barium, strontium Dissolve a little bit.
The carbonates are insoluble, It's lucky that it's so, Or else, our marble buildings Would melt away like snow.
(Repeat with feeling)
Only note is that all Lithium salts are
Copper (III) sulfate reacts with sodium hydroxide to form copper (III) hydroxide and sodium sulfate (all in water).
Occurs; Writing Equations:
a) Calcium Nitrate and Sodium Sulfate solutions are added together.
Ca(NO3)2 (aq) + Na2SO4 (aq) CaSO4 (s) + 2NaNO3 (aq)
Total Ionic Equation
Ca2+(aq)+2 NO3-(aq) + 2 Na+(aq)+ SO4-2(aq) CaSO4 (s) + 2 Na+(aq+) 2 NO3-(aq)
Net Ionic Equation
Ca2+(aq) + SO-2(aq) CaSO4 (s)
Spectator Ions are Na+ and NO3-
b) Ammonium Sulfate and Magnesium Chloride are added together.
In exchanging ions, no precipitates will be formed, so there will be no
chemical reactions occurring! All ions are spectator ions!
and ionic equations
for this reaction.
Ionic equation: Ag+(aq) + Cl-(aq) AgCl(s)
2Na (s) + Cl2(g) 2NaCl(s)
Write a net ionic equation for this reaction!
Cu+2(aq) + Fe(s) Cu(s) + Fe+2(aq)
Acids - A Group of Covalent Molecules Which Lose Hydrogen Ions to Water Molecules in Solution
When gaseous hydrogen iodide dissolves in water, the attraction of the
oxygen atom of the water molecule for the hydrogen atom in HI is
greater that the attraction of the of the iodide ion for the hydrogen atom,
and it is lost to the water molecule to form an hydronium ion and an
iodide ion in solution. We can write the hydrogen atom in solution as
either H+(aq) or as H3O+(aq) they mean the same thing in solution. The
presence of a hydrogen atom that is easily lost in solution is an “Acid”
and is called an “acidic” solution. The water (H2O) could also be written
above the arrow indicating that the solvent was water in which the HI
HI(g) + H2O(L) H+(aq) + I -(aq)
HI(g) + H2O(L) H3O+(aq) + I -(aq)
HI(g) H+(aq) + I -(aq)
NH3(aq) + H2O(l) NH4+(aq) + OH-(aq)
HNO3(aq)+ H2O(l) NO3-(aq) + H3O+(aq)
An acid or base that ionizes completely in water. It is present entirely as ions; it is a strong electrolyte.
H2SO4, sulfuric acid
The photo shows baking soda (sodium bicarbonate) reacting with acetic acid in vinegar to give bubbles of carbon dioxide.
Write the reaction that’s occurring.
Moles of Solute Moles
Liters of Solution L
M = =
solute = material dissolved into the solvent
In air , Nitrogen is the solvent and oxygen, carbon dioxide, etc.
are the solutes.
In sea water , Water is the solvent, and salt, magnesium chloride, etc.
are the solutes.
In brass , Copper is the solvent (90%), and Zinc is the solute(10%)
Molar mass of K2Cr2O7 is 294 g.