液堿即液態狀的氫氧化鈉，亦稱燒堿、苛性鈉。燒堿的工業品有液體和固體，其中液體為不同含量的氫氧化鈉水溶液；固體白色不透明，常製成片、棒、粒狀，或熔融態以鐵桶包裝。
純品為無色透明液體。相對密度2.130，熔點318.4℃，沸點1390℃。
|
密度 (20℃ )
|
質量分數g/100g
|
量濃度 (mol/L)
|
密度 (20℃ )
|
質量分數g/100g
|
量濃度 (mol/L)
|
|
1.000
|
0.159
|
0.0393
|
1.270
|
24.645
|
7.824
|
|
1.005
|
0.602
|
0.151
|
1.275
|
25.10
|
8.000
|
|
1.010
|
1.045
|
0.264
|
1.280
|
25.56
|
8.178
|
|
1.015
|
1.49
|
0.378
|
1.285
|
26.02
|
8.357
|
|
1.020
|
1.94
|
0.494
|
1.290
|
26.48
|
8.0539
|
|
1.025
|
2.39
|
0.611
|
1.295
|
26.94
|
8.722
|
|
1.030
|
2.84
|
0.731
|
1.300
|
27.41
|
8.906
|
|
1.035
|
3.29
|
0.851
|
1.305
|
27.87
|
9.092
|
|
1.040
|
3.745
|
0.971
|
1.310
|
28.33
|
9.278
|
|
1.045
|
4.20
|
1.097
|
1.315
|
28.80
|
9.466
|
|
1.050
|
4.655
|
1.222
|
1.320
|
29.26
|
9.656
|
|
1.055
|
5.11
|
1.347
|
1.325
|
29.73
|
9.847
|
|
1.060
|
5.56
|
1.474
|
1.330
|
30.20
|
10.04
|
|
1.065
|
6.02
|
1.602
|
1.335
|
30.67
|
10.23
|
|
1.070
|
6.47
|
1.731
|
1.340
|
31.14
|
10.43
|
|
1.075
|
6.93
|
1.862
|
1.345
|
31.62
|
10.63
|
|
1.080
|
7.38
|
1.992
|
1.350
|
32.10
|
10.83
|
|
1.085
|
7.83
|
2.123
|
1.355
|
32.58
|
11.03
|
|
1.090
|
8.28
|
2.257
|
1.360
|
33.06
|
11.24
|
|
1.095
|
8.74
|
2.391
|
1.365
|
33.54
|
11.45
|
|
1.100
|
9.19
|
2.527
|
1.370
|
34.03
|
11.65
|
|
1.105
|
9.645
|
2.664
|
1.375
|
34.52
|
11.86
|
|
1.110
|
10.10
|
2.802
|
1.380
|
35.01
|
12.08
|
|
1.115
|
10.555
|
2.942
|
1.385
|
35.50
|
12.29
|
|
1.120
|
11.01
|
3.082
|
1.390
|
36.00
|
12.51
|
|
1.125
|
11.46
|
3.224
|
1.395
|
36.495
|
12.73
|
|
1.130
|
11.92
|
3.367
|
1.400
|
36.99
|
12.95
|
|
1.135
|
12.37
|
3.510
|
1.405
|
37.49
|
13.17
|
|
1.140
|
12.83
|
3.655
|
1.410
|
37.99
|
13.30
|
|
1.145
|
13.28
|
3.801
|
1.415
|
38.49
|
13.61
|
|
1.150
|
13.73
|
3.947
|
1.420
|
38.99
|
13.84
|
|
1.155
|
14.18
|
4.095
|
1.425
|
39.495
|
14.07
|
|
1.160
|
14.64
|
4.244
|
1.430
|
40.00
|
14.30
|
|
1.165
|
15.09
|
4.395
|
1.435
|
40.515
|
14.53
|
|
1.170
|
15.54
|
4.545
|
1.440
|
41.03
|
14.77
|
|
1.175
|
15.99
|
4.697
|
1.445
|
41.55
|
15.01
|
|
1.180
|
16.44
|
4.850
|
1.450
|
42.07
|
15.25
|
|
1.185
|
16.89
|
5.004
|
1.455
|
42.59
|
15.49
|
|
1.190
|
17.345
|
5.160
|
1.460
|
43.12
|
15.74
|
|
1.195
|
17.80
|
5.317
|
1.465
|
43.64
|
15.98
|
|
1.200
|
18.255
|
5.476
|
1.470
|
44.17
|
16.23
|
|
1.205
|
18.71
|
5.636
|
1.475
|
44.695
|
16.48
|
|
1.210
|
19.16
|
5.796
|
1.480
|
45.22
|
16.73
|
|
1.215
|
19.62
|
5.958
|
1.485
|
45.75
|
16.98
|
|
1.220
|
20.07
|
6.122
|
1.490
|
46.27
|
17.28
|
|
1.225
|
20.53
|
6.286
|
1.495
|
46.80
|
17.49
|
|
1.230
|
20.98
|
6.451
|
1.500
|
47.23
|
17.75
|
|
1.235
|
21.44
|
6.619
|
1.505
|
47.85
|
18.00
|
|
1.240
|
21.90
|
6.788
|
1.510
|
48.88
|
18.20
|
|
1.245
|
22.30
|
6.958
|
1.515
|
48.905
|
18.52
|
|
1.250
|
22.82
|
7.129
|
1.520
|
49.44
|
18.78
|
|
1.255
|
23.275
|
7.302
|
1.525
|
49.97
|
19.05
|
|
1.260
|
23.73
|
7.475
|
1.530
|
50.50
|
19.31
|
|
1.265
|
24.19
|
7.650
|
|
|
|