Solutions & Electrochemistry

osmotic pressure equation

Answer B

in mmol

100ml —> .1L * 0.1 = 0.01mol —→ 10mmol

just find kb= what

Ka=10^-9

-log(Ka)= 9 = pKa

14-9=5 = pKb

or

answer A

Passage A

Passage A

Answer B

Passage A

Answer: D

Just solve

an external power source (ex. battery) supplies an electric ucrrent to drive a nonspontaneous (G>0) redox reaction, which in turn converts electrical energy into chemical energy. (electrolytic or galvanic/voltaic cell)?

electrolytic

Cell potential equation

E cell= Ered (cathode)- Ered (anode)

involves a spontaneous (G<0) reaction that converts chemical into electrical energy (produces electric current) (electrolytic or galvanic/voltaic)

galvanic cell

Passage B

Passage A

Answer A

No, electrolytic is non-spontaneous, but the passage said its spontaneous (so its volcaic/galvanic)

Passage A

just state for the ions, which side it goes to…

NO3- goes to anode

K+ goes to cathode

anode

where oxidation occurs (loses electron)

cathode

where reduction occurs (gains electron)

1F= 1mol

0.61 F= 0.61 mol e-

0.61mol e- * (1mol Al(s)/3 mol e-) = 0.2mol Al(s)

Answer: 0.2mol *27= 5.4g Al (s)

More engative E means better anode because it would more likely to be oxidized

so zinc and magnesium