A rechargeable battery is constructed based on a concentration cell constructed of two Ag/Ag+ half-cells. The volume of each half-cell is 2.0 L and the concentrations of Ag+ in the half-cells are 1.25 M and 1.0 x 10-3 M.
a. How long can this battery deliver 2.5 A of current before it goes dead?
b. What mass of silver is plated onto the cathode by running at 3.5 A for 5.5 h?
c. Upon recharging, how long would it take to redissolve 1.00 x 102 g of silver at a charging current of 10.0 amps?
Kyle LaPage Allison Moore (12129)-Tues/12 2/23/16 Pre lab.- exp. 5 1. The CAS registry number is 76-59-5. The IUPAC name is 2-bromo-4-[3-(3-bromo-4-hydroxy-2- methyl-5-propan-2-ylphenyl)-1,1-dioxobenzo[c]oxathiol-3-yl]-3-methyl-6-propan-2-ylphenol. The chemical formula is C 27B28O2S.5 1 2. Bromothymol blue is an indicator meaning it changes color with pH change. They are usually weak acids or bases, but their conjugate base or acid forms have different colors due to differences in 2 their absorption spectra. 3. A buffer is a solution that can resist pH change upon the addition of an acidic or basic components. 3 4. A=ԑlc A=absorbance ԑ= absorptivity l=pathlength c=concentration 5. +¿ ¿(SCN) ¿ ¿ 2+¿ ¿ ¿ ¿ −¿ SCN ¿ ¿ K c¿ 6. Ni (aq) SCN(aq) Ni(SCN) (aq) Initial 0.0006M 0.0002M 0M Change -6x10 -6 -6x10 -6 +6x10 -6 Equilibrium 5.94x10 -4 1.94x10 -4 6x10 -6 a. -6 -4 0.006-6x10 = 5.94x10 b. 0.0002-6x10 = 1.94 -4 c. 5.94x10 1.94x10 [¿¿−4][¿¿−4]=52.07 ¿ −6 [6x10 ] K c ¿ 7. Sodium phosphate monobasic- Slightly hazardous in case of skin co