Thermochemistry
In a reversible process, does the entropy in increase, decrease, or remain the same.
The entropy remains the same
A large value of K tells us what about where the reaction lies?
Reaction lies towards the right
What is acid base equilibria?
Acid base equilibria favors the side of the reaction with the weaker acid or base
Provide an example of a spontaneous process
Ice freezing,etc.
The degree of dissociation does not depend on what?
Pressure (it does depend on temp, solute, and solvent)
What is a base
accepts H+ ions in water and neutralizes acids
Provide an example of a nonspontaneous process
Boiling water
Adding what will increase the ionization?
Addition of water- due to it's extremely polar structure and it will act as a base in this case
what is an acid
A hydrogen containing substance that is able to donate H+ ions to another substance.
60J of work is done on a gas, and the gas loses 150J of heat to its surroundings. Calculate the change in energy.
Delta E= -150+60= -90J
What is the pH of a solution consisting of 0.75M HC2H3O2 and 0.50M NaC2H3O2. The Ka is 1.8 x 10^-5.
pH= 4.744 + log(0.50/0.75)
pH=4.57
The concentration of [OH-]= 3.7 x 10^-4. Calculate the [H3O+] concentration
1 x 10^-14= [H3O+] (3.7 x 10^-4)
[H3O+]= 2.7
A gas starts with 200J of energy. While you add 180J of heat to the gas, the gas does 70J of work. What is the final energy of the gas?
Efinal-200J=180-70
Efinal= 310
What is the pH of a solution containing 0.15 mol of NH4Cl and 1.5 mol of NH3. Kb= 1.8 x 10^-5
pKb= -log(1.8 x 10^-5) = 4.745
pKa + pKb= 14 so, pKa= 9.26
pH= 9.26+log(1.5/0.15)= 10.26
2.5 x 10^-7