Acell is built using two electrodes: what reaction occurs at the cathode?
al3+ + 3e —> al e° = -1.66v
cu2+ + 2e —> cu e° = +0.34v

a. cu —> cu2+ + 2e-
b. cu2+ + 2e- —> cu
c. al3+ + 3e- —> al
d. al —> al3+ + 3e-

If equal masses of the listed metals were collected , which would have a greatest volume ? a. aluminum 2.70,b. zinc7.14,c. copper 8.92,d. lead 11.34

Calculate the ph at the equivalence point for the titration of a solution containing 150.0 mg of ethylamine (c2h5nh2) with 0.1000 m hcl solution. the volume of the solution at the equivalence point is 250.0 ml. kb forethylamine is 4.7 × 10−4 .

6) (a) calculate the absorbance of the solution if its concentration is 0.0278 m and its molar extinction coefficient is 35.9 l/(mol cm). the depth of the cell is 5 mm. (b) what is the %t? (7) calculate the absorbance of the solution if the transmitted light intensity is 70% of the initial light beam intensity