Biochemistry 1 strength review
Acid and Base Strength
Acid and base strength degree of dissociation (to form H+ & anion)
Not a measure of concentration
Strong acids and bases reaction with water is virtually 100% (Strong
electrolytes)
Strong Acids and B
Biochemistry 1 Molality review
Molality
Solute concentration is expressed in mole-based units
Number of particles is critical, not the mass of solute
Molality (m) = moles of solute per kg of solvent
The denominator is in kg solvent, not in kg solution
Biochemistry 1 liquids review
Remember, liquids are not included in equilibrium expressions
Ion Product of Water
This Keq constant is also called the ion product for water and has the symbol Kw
Since [H3O+] = [OH-] = 1.0 10-7 M, what is the value for Kw?
Biochemistry 1 final review
Calculating [H3O+] from pH
What is the [H3O+] of a solution with pH = 6.00?
4.00 = -log [H3O+]
Multiply both sides of equation by 1
-4.00 = log [H3O+]
Take the antilog of both sides
Antilog 4.00 = [H3O+]
Antilog is the exponent
Biochemistry 1 conjugate acids review
Conjugate Acids and Bases (obtained from Weak Acids/Weak Bases)
The acid base reaction can be written in the general form:
Notice the reversible arrows
If HA is a weak acid, it dissociates to form a conjugate base.
If
Biochemistry 1 Charge review
Emphasis on charge
Equivalents
1 M Na3PO4
What is the concentration of PO43- ions?
1M
What is the concentration of Na+ ions?
3M
Equivalent is defined by the charge
New concentration unit: Equivalents/Liter
This is very importa
Biochemistry 1 Freezing point review
Freezing Point Depression
Freezing point depression (DTf) - is proportional to the number of solute
particles
Solute particles, not just solute
How does an electrolyte behave?
Dissociate into ions
An equal concentrat
BioChemistry 1hydrochloric acid review
Determine the Concentration of a Solution of Hydrochloric Acid
Place a known volume of acid whose concentration is not known into a
flask
Add an indicator, experience guides selection, here phenol red is good
Known c
Biochemistry 1 Voltaic Cells
Voltaic Cells
Voltaic cell electrochemical cell that converts stored chemical energy
into electrical energy
Lets consider the following reaction:
Zn(s) + Cu2+(aq) Zn2+(aq) + Cu(s)
Voltaic Cells
If the two reactants are placed
Biochemistry 1 Basis and acids
Calculating Osmotic Pressure
Calculate the osmotic pressure of a 5.0 10-2 M solution of NaCl at 25C (298 K)
Definition of osmotic pressure, =MRT
M is osmolarity =
[5.0 10-2 mol NaCl / L] 2 mol particles
1 mol NaCl
= 1.0 10-1