130
DYEING AND CALICO PRINTING.
Percentage
NaHO.
Degrees Twaddle, -
3'5
10
5 '°
14
6'5
19
8-o
24
I0'O
29
ti-5
34
13-0
40
H '5
45
i6 - o
5 °
I 7'5
53
ig - o
56
20-3
60
22*0
63
23-0
66
1 c.c. of normal oxalic acid corresponds to 0-031 grm. of caustic soda.
Ammonia, NH 3 , is very variously prepared, and a description of theprincipal processes would be necessarily too long for these pages. The
following table shows the percentage ofthe corresponding specific gravity :—
ammonia contained in a solution of
Percentage
NH„.
Specific Gravity.
5 ' 5 °
q
d
00
6'oo
0-976
6-50
o -974
7-00
0-972
7 ' 5 °
0-970
8-oo
0-968
8-50
0-965
9-00
0-963
9 ' 5 °
o-g6i
io-oo
0-959
10-50
0-957
iroo
o -955
11-50
o -953
12-00
0-951
13-46
o -947
I 7 ' 5 2
0-932
I 9'54
0-925
25'39
0-905
26-00
o-goo
31-30
0-824
32-50
0-875
i c.c. of normal oxalic acid neutralises exadtly 0-017 grm. of caustic ammonia.5 c.c. of the liquid ammonia to be tested should be taken in a pipette andcoloured blue with litmus solution. The normal oxalic acid solution is addedfrom the burette. Suppose 41 c.c. of the normal acid solution to have beenrequired to neutralise the ammonia, the 5 c.c. of liquid ammonia will havecontained 0-017x41=0-697 grm. of caustic ammonia. Suppose the liquid