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27 Cards in this Set

  • Front
  • Back
What is a hydrogen ion? (H+)
a +1 charge proton that a hydrogen atom left behind while shifting from one molecule to another.
what is a hydroxide ion? (OH-)
a charge -1. The molecule that lost a hydrogen ion.
what is a hydronium ion? (H30+)
A molecule which a hydrogen ion binded to
2h20 =
h30+ + OH-
True or False: Conventionally H3O+ is represented as H+
True. H+ cannot exist on its own, it attaches to a H2O
True or False: The equilibrium point for 2H2O = H3O+ + OH- is equal.
False. Water outweighs.
True or False: When acids dissolve in water, they donate an OH-
False. When acids dissolve in water they donate a H+
What is an acid?
A substance that increases the H+ concentration of a solution
What is a base?
A substance that decreases the H+ of a solution
True or False: Some bases reduce the H+ concentration directly by accepting hydrogen ions.
True. Ex. NH3 + H+ = NH4+
True or False: Bases cannot indirectly dissociate H+
False. Bases can reduce the H+ concentration indirectly by dissociating to form OH-
Are solutions with higher OH- than H+ basic, acid, or neutral?
Basic
Are solutions with higher H+ than OH- basic, acid, or neutral?
Acid
Are solutions with equal H+ and OH- basic, acid or neutral?
Neutral
True or False: You are unable to reverse a reaction for weak acids.
False. Strong acids and basis are virtually irreversible.
[H+][OH-]=
10^(-14)
True or False: acids reduce OH- from solution.
True. adding H+ reduce OH- by forming water.
True or False: Bases do not affect the concentration of H+ in a solution.
False. Adding OH- reduce H+ by forming water.
In terms of logarithm pH =
-log[H+]
True or False: pH increases as H+ increases.
False. pH declines as H+ increases.
True or False: Each pH unit represents a tenfold difference in H+ and OH-
True. This is why the pH scale is so compact
True or False: a solution of pH 3 is twice as acidic as a solution of pH 6.
False. It is 1000 times as acidic. The units are in tens
What is the average internal pH of most living things?
7
What are Buffers?
Substances that minimize changes in the concentrations of H+ and OH- in a solution
How to Buffers minimize changes in H+ and OH-?
They accept H+ when they are in excess or donate when they are depleted
True or False: Most buffers are acid.
False. They are acid-base pairs, which means they can react to either H+ or OH- within a certain range.
What is Acid precipitation?
when rain, snow or fog has a pH lower than pH 5.2