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