1334 
Bromine and methyl-alcohol. 
Quality of Light 
Time of 
exposure 
Amount of 
bromine 
added 
in grams. 
Unchanged 
bromine. 
Volume of solution. 
a) Sunlight 
150' 
0.06527 
0.01154 
1 5 c.c. methyl-alcohol and 
Darkness 
150' 
Do 
0.06205 
1 10 c.c. bromine water. 
b) Sunlight 
280' 
Do 
0.00903 
lOc.c. methyl-alcohol and 
Darkness 
280' 
Do 
0.05420 
( 10 c c. bromine water. 
c) Diffused light 
155' 
Do 
0.01998 
f 5 c.c. methyl-alcohol and 
Darkness 
155' 
Do 
0.06210 
10 c.c. bromine water. 
d) Diffused light 
283' 
Do 
0.01610 
f 10 c.c. methyl-alcohol and 
Darkness 
283' 
Do 
0.05412 
( 10 C.C. bromine water. 
it has also been observed that the action of bromine on methyl 
alcohol is also accelerated by light. Price (Zeit. Phys. Chem. 1898, 
27 , 474) has shown that persulphates slowly liberate iodine from 
a solntion of potassium iodide. 
Now it has been found out that persulphates can slowly liberate 
bromine from a solution of bromides and that in presence of light 
the action is much rnoi'e rapid than in darkness 
2 NaBr + Na.S.O^ = 2 Na,SO, + Br,. 
Sodium persulphate and Potassium bromide. 
Quality of Light. 
Time of 
exposure. 
1 Amount of 
bromine liberated. 
Volume of solution. 
1) Sunlight 
300' 
0.00508 
i 25 c.c. N KBr and 10 c.c. 
Darkness 
300' 
0.00406 
1 1 “ sodium persulphate. 
2) Sunlight 
420' 
0.00687 
Darkness 
420' 
0.00575 
1 Do 
3) Sunlight 
480' 
0.00923 
) 25 c.c. N KBr and 20 c.c. 
Darkness 
480' 
0.00801 1 
1 jjj sodium persulphate. 
4) Diffused light 
540' 
0.00776 
1 25 c.c. N KBr and 10 c.c. 
Darkness 
540' 
0.00712 
1 ™ sodium persulphate. 
5) Diffused light 
620' 
0.00916 
1 25 c.c. N KBr and 10 c.c. 
Darkness 
620' 
0.00849 
] ^ 
1 sodium persulphate. 
