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Second lab
Review
27
Other
Undergraduate 4
01/25/2012

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Cards

Term
What's an acid?
Definition
a substance that donates a proton
Term
What's a base?
Definition
a substance which accepts a proton.
Term
Can water donate a proton or accept a proton?
Definition
It can do both.
Term
Strong acids & bases ______ completely in water
Definition
dissociate
Term
What happens to a weak acid in water?
Definition
Weak acids donate a proton to water to form hydronium (H3O+) ions
Term
What happens to a weak base in water?
Definition
Weak bases accept a proton to form a conjugate acid
Term
At equilibrium, dissociation occurs at a ______ rate
Definition
constant
Term
Ka
Definition
Describes the rate of a reaction, it's the dissociation constant
Term
The negative log of Ka is known as?
Definition
pKa
Term
As pKa increases, what happens to Ka?
Definition
It decreases
Term
Dissociation constant for bases?
Definition
Kb
Term
Henderson-Hasselbalch pH equation
Definition
pKa + log [conjugate base]/[weak acid]
Term
% Ionization for weak acids =
Definition
100/ [1 + 10 (pKa-pH)
Term
Important property of a buffer
Definition
Resists large pH fluctuations upon addition of relatively large quantities of strong acid or strong base
Term
Buffer pH depends on?
Definition
the concentration of each component of the buffer pair
Term
Buffer Range
Definition
It is the range at which the buffer is most effective in resisting changes of pH.
Term
What is the composition of a buffer?
Definition
Weak acid and it's salt
Term
Dihydrogen phosphate ions (H2PO4-) act as a??
Definition
Acid
Term
Hydrogen phosphate ions (HPO42-) act as a?
Definition
Base
Term
When the buffered pH is close to pKa, what happens to buffering capacity?
Definition
it increases
Term
How is buffering capacity expressed?
Definition
The moles of NaOH to increase pH by one unit or the moles of HCl to decrease pH by one pH unit
Term
What happens to buffering capacity as the moles of a buffer increases?
Definition
Buffering capacity increases
Term
Is pH indicator a weak acid or a base?
Definition
It can be both
Term
For labs 2-11 we wash glassware with?
Definition
tap water
Term
Whats solubility?
Definition
Solubility is the property of a solid, liquid, or gaseous chemical substance called solute to dissolve in a solid, liquid, or gaseous solvent to form a homogeneous solution of the solute in the solvent
Term
Most drugs are?
Definition
Weak acids or bases
Term
Generally which is less soluble? Undissociated form or it's salt?
Definition
Undissociated
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