P-5-9B In order to study the photochemical decay of aqueous bromine in bright sunlight, a small quantity of liquid bromine was dissolved in water contained in a glass battery jar and placed in direct sunlight !he following data were obtained at "5 #
%$!ime &min' ppm Br "
() "+5
") (+
*) ("*
+) )..
5) )"
) )++
a' /etermine /etermine whether whether the reaction reaction rate rate is 0ero, first, first, or second second order order in bromine, bromine, and calcula calculate te the reaction rate constant in units of your choice b' 1ssuming identical e2posure conditions calculate the required hourly rate of injection of bromine &in pounds' into a sunlit body of water, "5))) gal in volume, in order to maintain a sterili0ing level of bromine of () ppm &1ns% )+* Ib3h' c' 4hat e2perim e2perimental ental conditi conditions ons would would you suggest suggest if you you were to obtain more more data data &6ote% ppm 7 parts of bromine per million parts of brominated water by weight In dilute aqueous solutions, ( ppm 7 ( milligram per liter' &8rom $alifornia Professional ngineers 2am' :awab% a α
r A =−k C
d C A dt
t &min' $1 &p &ppm'
t &min' ;t $1 &ppm' ;$1 ;$13;t
α
k C
=−
() "+5
") (+
()
*) ("*
") ()
"+5 -)( -))(
+) )..
*) ()
(+
+) ()
("* -)5( -))5(
5) )"
5) ()
).. -)*5 -))*5
) )++
() )"
-)" -))"
) )++ -)(. -))(.
Berdasar
0
10
20
30
40
50
60
6ilai d$13dt didapat
)) -"5 ).9
)) -".(* )55+
))+* -*(+ )")
))*) -*5) -)(".
))"* -*" -)+.
))( -+)5 -)."(
6ilai = didapat
y =m x + c
ln
(
−
d C A dt
)
=
α ln ( C A ) + ln ( k )
/engan mengguna
>ehingga, persamaan garisnya adalah
y =0.892 x −3.349
ln
(
−
d C A dt
)
=
α ln ( C A ) + ln ( k )
ln
(
−
d C A dt
)
= 0.892ln
( C A )
− 3.349
Berdasar
−1
k =0.035 min b
V
dC dN = = V r = F A B dt dt
r A =−0.035
ppm g g g =−0.035 =−0.035 =−0.035 =−0.035 6 6 3 min 10 gmin 10 mL min 10 L min
(
F B=r A V =
F B=0.438
0.035
mg L min
1g
1 lb m
1000 mg 453.6 g
)
60 min 3.785 l 1h
1 gal
−3
⋅
10
25000 gal
l bm h
c. ?ondisi
e
yang
saya
saran
mempengaruhi nilai
g =−0.03 L min
