Ph and Water
Which heats more rapidly ethyl alcohol or water
ethyl alcohol
How many times more basic is a solution with a pH of 9 than a solution with a pH of 8?
10
PH values represent how many changes in ion concentration.
10 fold changes
How many times more basic is a solution with a pH of 10 than a solution with a pH of 8?
100
how many hydrogen bonds can a water molecule form with other water molecules
4 hydrogen bonds
pH after adding acid (water)
5
Initial pH of milk
6
pH after adding acid (milk)
6
pH after adding base (milk)
6
How much water are humans made up of.
60-90%
what is the initial ph of tap water
7
pH after adding base (tap water)
8
0-6
Acidic on the pH scale
What is adhesion?
An attraction between molecules of different substances
What is cohesion?
Attraction between molecules of the same substance
which is more concentrated in low ph H+ or OH-
H+
CO2 + H2o=
H2CO3 (carbonic acid)
Who wrote The fitness of the enviroment
Henderson
7
Is neutral/water
Solutions with more (H+) are what?
More acidic
Solutions with less (H+) are...?
More basic
Are the reactive qualities of ammomia due to an excess of H+ or OH-
OH-
Which is more concentrated in a low pH solution H+ (hydrgen ion) or OH- (hydroxl ion)
OH- hydroxly ion
palm springs is almost directly inland from Santa Monica, which of these places has more water nearby and in the air.
Santa Monica
What is a hydroxyl ion?
equal concentration in pure water. Decreases in acid and increases in bases.
What is created when carbon dioxide and water are mixed?
a weak acid, aka carbonic acid
what has a lower boiling point.
alchohol
Which cools more rapidly
alcohol
which heats up faster
alcohol
8-14
basic
Do soaps and cleaners tend to me acidic or basic.
basic
is a solution with a "high" ph acidic or basic?
basic
is a solution with a high pH acidic or basic?
basic
Did the milk buffer 1. acid 2. base or both?
both
Define polar
can dissolve in water, hydrophobic
would you conclude that the ph of soda is strongly influenced by?
carbonation
define evaporate
change from liquid to gas.
define adhesion
charged poles of water molecules bonding with other substances that are charged. Allows for water molecules to hold other molecules and ions.
mosquitoes can walk on water because of adhesion or cohesion
cohesion
Define nonpolar
doesn't like water, hydrophilic
should a humid or dry night get colder?
dry
Adsorption
enables water too "wet" other substances.
are substance with high specific heat harder or easier to heat up than those with low specific heat
harder
define buffers
have the ability to resist pH change by chemically incorporating excess H+ (hydrogen ions) or donating H+ when it is depleted. blood and milk contain natural buffer systems
define specific heat
he amount of heat necessary to raise the temperature of one gram of that substance one degree centigrade.
assuming organisms function best if their internal temperatures remain relatively constant as outside temperatures change, would a body fluid with a high or low specific heat be best?
high
to regulate body temp would it be better to have a body fluid with a high or low specific heat?
high
What is the measure of a PH of a solution?
hydrogen ion (H+).
why does water evaporate slowly
it requires a great deal of heat
is water acid or base
neither
would you conclude that the ph of fruit juice is strongly influenced by?
neither
Did the H+ concentration of fresh soda pop and flat soda pop differ by a magnitude of 10 times or greater?
no
why are water molecules polar
one end is negatively charged due to the oxygen atom and the other end is postively charged due to the hydrogen atoms
Palm springs or santa monica experiences both hotter and colder temperatures?
palm springs
Example of 10 fold changes
ph of 2 is ten times more (H+) then a ph 3 solution and 100 times more then a (H+) than a solution with a pH of 4.
Is water polar or non-polar?
polar
define cohesion
the ability of water molecules to bond to each other (because they are polar)
define the heat of vaporization
the amount of heat necessary to cause a liquid to evaporate (liquid to gas)
Define specific heat
the heat required to raise the temperature of the unit mass of a given substance by a given amount
Which has the higher specific heat water or alcohol?
water
which has a higher specific heat ethyl alcohol or water
water
define surface tension
when cohesion allows water molecules to form an almost membrane-like outer layers
define capillary action
when water is drawn up by small tubes with diameters, involves forces known as cohesion and adhesion
Which has more hydrogen ions wine or water
wine
Did the H+ concentration of diet soda and regular soda differ by magnitude of 10 times or greater?
yes
Did the H+ concentration of pure water and sugar water differ by a magnitude of 10 times or greater?
yes
Did your experimental results agree with the fact that milk is a pH buffer?
yes
If your blood and tissue fluid were alcohol instead of water , would you be more likely to get overheated on a hot day?
yes
Vinegar is an acetic acid solution. Does it's ph agree?
yes
is water an efficient evaporative cooler. If so, why?
yes, it has a high heat of vaporatation so it can absorb a lot of heat before it evaporates