Upload
stuart-white
View
217
Download
3
Embed Size (px)
Citation preview
MolesMoles
1 mole = 6.022 x 1 mole = 6.022 x 10102323
1 pair = 21 pair = 2
1 dozen = 121 dozen = 12
Etc.Etc.
1 mole of atoms = 1 mole of atoms = the atomic weight the atomic weight on periodic tableon periodic table
Practice calculationsPractice calculations
How much would a mole of KNOHow much would a mole of KNO33 weigh?weigh?
How much would a mole of acetic How much would a mole of acetic acid (CHacid (CH33COOH) weigh?COOH) weigh?
How much would a mole of copper (II) How much would a mole of copper (II) phosphate (Cuphosphate (Cu33(PO(PO44))22) weigh?) weigh?
More practice More practice problemsproblems How many moles is 3.0 grams of How many moles is 3.0 grams of
sugar (Csugar (C66HH1212OO66)?)?
35.0 g of CaCO35.0 g of CaCO33 is how many moles? is how many moles?
0.17 moles of Na0.17 moles of Na22HPOHPO44 is how many is how many grams?grams?
Concentration UnitsConcentration Units Molarity (moles of Molarity (moles of
solute/liter of solute/liter of solution)solution)
If a solution of HCl If a solution of HCl contains 3.15g of contains 3.15g of HCl in 25mL, what HCl in 25mL, what is the molarity of is the molarity of the solution?the solution?
I want to make I want to make 500mL of a 0.05M 500mL of a 0.05M NaOH, how may NaOH, how may grams of NaOH do grams of NaOH do I need?I need?
pH scalepH scale
Neutral pH?Neutral pH? Acidic pH?Acidic pH? Basic pH?Basic pH? pH = -log[H+]pH = -log[H+] Log scale Log scale
therefore pH of 1 therefore pH of 1 is 10x more acidic is 10x more acidic than a pH of 2than a pH of 2
pH scale continuedpH scale continued A solution has a [H+] of 0.01M. What A solution has a [H+] of 0.01M. What
is its pH?is its pH? The [H+] is 0.005M pH = ?The [H+] is 0.005M pH = ? Windex has a pH of ____, what is its Windex has a pH of ____, what is its
[H[H++]?]? SnoBowl has a pH of ____, what is its SnoBowl has a pH of ____, what is its
[H[H++]?]?
As pH increases acidity decreasesAs pH increases acidity decreases
Acids/ Bases & LifeAcids/ Bases & Life
pH of blood must be between 7.3-pH of blood must be between 7.3-7.57.5
How is this done?How is this done? Buffers: substance which resists Buffers: substance which resists
changes in pHchanges in pH Carbonate buffer system is Carbonate buffer system is
important for maintaining pH in important for maintaining pH in biological systemsbiological systems
Acid Rain Acid Rain DemonstrationDemonstration
Which areas are more susceptible to Which areas are more susceptible to the effects of acid rain, areas with thin the effects of acid rain, areas with thin soils and granite underneath or areas soils and granite underneath or areas with carbonate soils? Why?with carbonate soils? Why?
CaCOCaCO33 + H + H++ Ca Ca2+2+ + HCO + HCO33--
Limestone weatheringLimestone weathering2KAlSi2KAlSi33OO88 + 2H + 2H++ + H + H22O O Al Al22SiSi22OO55(OH)(OH)44 + 4SiO + 4SiO22
+ 2K+ 2K++
Feldspar Feldspar weatheringweathering
Acid Rain Chemistry 107Acid Rain Chemistry 107Location pH w/acid w/base
Richards 6.62 6.8 6.85
Winona 6.66 6.76 6.74
snow 6.96 6.5 6.59
distilled 6.04 5.85 6.35
Tap (dorms) 6.66 6.29 6.5
snow 5.98 3.59 5.63
well water 6.73 6.28 6.57
Lake Winona 6.24 6.04 6.07
Mississippi 6.23 6.04 5.93
Richards 6.42 6.32 6.45
Root River 7.26 6.83 7.2
Mississippi 7.2 7.19 6.99
distilled 7.43 4.29 3.94?
campus (tap) 7.5 7.18 7.5
faucet (house) 7.19 7.05 7.13
distilled 6.19 3.7 6.94
Somsen 7 6.73 7.22
Lake Winona 7.26 6.87 7.26
Tap (dorms) 7.15 7.07 7.28