Post on 15-Jan-2016
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pH Ionization and Hydrogen Bonding
pHpH is the concentration of hydrogen ions in
a solution
Strong Acid and BaseHCl – hydrochloric acid
Strong acidH+ loses electron to Cl-Solution would have a HIGH concentration of
H+ ions
NaOH – sodium hydroxideStrong baseNa+ loses electron to OH-Solution would have a HIGH concentration of
OH- ions
BuffersWeak acids/bases that react with strong
acids or bases to have a gradual shift in the pH scale
Ex: Milk calming stomach acid
Why is water neutral?The molecule of H2O separates into
H+ loses electron to OH-Equal parts of each ion H2O has a neutral pH of 7
pH scale
DemonstrationAre the pieces of paper without water more
attracted to each other?Why are the pieces of paper with water
easier to stick together?What is holding the papers together?
Water is a polar moleculePartial negative pole and partial positive side
Hydrogen bondingDue to partial positive and partial negative
poles on the water molecule, other water molecules are attracted to each causing a hydrogen bond
Not as strong as covalent or ionic bonding
Hydrogen Bondhttp://programs.northlandcollege.edu/biolo
gy/Biology1111/animations/hydrogenbonds.html
What are the other unique properties of water?
Cohesion
Cohesion – Surface Tension
Adhesion
Adhesion - Capillary ActionHow water moves up plantsPlant tubes (xylem) are made of cellulose
which is polarWater molecules are attracted to the sides
of thin tubes of xylemWhat do you think will happen to the daisies?
Capillary ActionHow water moves
up plantsWater molecules
are attracted to the sides of thin tubes plant walls
This is also why water moves up a straw without you doing anything!
Activity!Drops of water on a pennyWhat properties of water are shown in this
experiment?