ASTM D501-03(2016)

Caustic Soda:

 Sampling

5

 Total Alkalinity as Sodium Oxide (Na₂O)

6 - 8

 Sodium Hydroxide (NaOH)

 9 - 11

 Carbonate as Sodium Carbonate (Na₂CO₃)

12

 Carbon Dioxide (CO₂) by the Evolution Method

13 - 16

Soda Ash:

 Sampling

17

 Matter Volatile at 150 to 155°C

18 and 19

 Total Alkalinity as Sodium Carbonate (Na₂CO₃ )

20 - 22

 Sodium Bicarbonate (NaHCO₃)

23 - 25

 Sodium Bicarbonate (NaHCO₃) by Potentiometric Titration

26 - 28

 Matter Insoluble in Water

29 and 30

 Apparent Density

31 and 32

Modified Soda (Sequicarbonate Type):

 Sampling

33

 Total Alkalinity as Sodium Oxide (Na₂O)

34 - 36

 Sodium Bicarbonate (NaHCO₃) and Sodium Carbonate (Na₂CO₃)

37 - 39

 Matter Insoluble in Water

40

Sodium Bicarbonate:

 Sampling

41

 Sodium Bicarbonate, Sodium Carbonate, and Free Moisture

42 - 45

 Matter Insoluble in Water

46

Sodium Metasilicate, Sodium Sesquisilicate and Sodium Orthosil-   icate:

 Sampling

47

 Total Alkalinity as Sodium Oxide (Na₂O)

48 - 50

 Total Silica as SiO₂

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