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Titration standards for preparation of buffer solutions – рН working standards of 1st category

Titration standards for preparation of buffer solutions – рН working standards of 1st category
Titration standards for preparation of buffer solutions – рН working standards of 1st category

Intended for

preparation of buffer solutions, reproducing and transmitting values of the activity index of hydrogen ions (pH) in aqueous solutions.

Titration standards represent quantities of chemical substances upon dissolution of which in a certain volume buffer solution - pH working standards are received. рН working standards of 1 category are prepared by diluting the quantity of substance with double-distilled water with specific electrical conductance (SEC) not more than 2·10-4 Cm/m. рН Working standards of 1 category are prepared in accordance with TC 2642-006-02567567-2010. Titration standards for preparation of buffer solutions – рН working standards of 1 and 2 categories of СТ-рН. Technical conditions.

Titration standards are contained in plastic bottles. The bottle is leakproof and has a screw cap with a protective ring. Titration standards СТ-рН-1 have 8 modifications differing in the composition of the quantity of substance, the concentration of chemicals in the prepared buffer solution and reproducible pH value.

Modifications of titration standards Name of chemical substances, included in titration standards Chemical formula of substances Weight of quantities of chemical substances, g Weight of quantities of chemical substances, g рН reproducible value at temperature +25°С
ST-рН-1-1 Potassium tetraoxalate dihydrate KH3(C2O4)2·2H2O 12,6100 0,05 1,646
ST-рН-1-2 Potassium hydrotartrate KНC4H4O6 9,50 saturated at temperature +25°С 3,557
ST-рН-1-3 Potassium hydrogenphthalate KНC8H4O4 10,1200 0,05 4,005
ST-рН-1-4 Potassium phosphate monosubstituted Sodium phosphate twice-substituted

KH2PO4

Na2HPO4

3,3880

3,5330

0,025

0,025

6,865
ST-рН-1-5 Potassium phosphate monosubstituted Sodium phosphate twice-substituted

KH2PO4

Na2HPO4

1,1790

4,3030

0,0087

0,0304

7,413
ST-рН-1-6 Sodium tetraborate decahydrate Na2B4O7·10H2O 3,8064 0,01 9,180
ST-рН-1-7 Sodium carbonate Sodium carbonate acid

Na2CO3

NaHCO3

2,6428

2,0947

0,025

0,025

10,012
ST-рН-1-8 Calcium hydroxide Са(OH)2 1,75 saturated at temperature +20°С 12,43

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