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Titration standards for preparation of buffer solutions – рН working standards of 2<sup>nd</sup> category

Titration standards for preparation of buffer solutions – рН working standards of 2<sup>nd</sup> category
Titration standards for preparation of buffer solutions – рН working standards of 2<sup>nd</sup> category

Intended for

the preparation of buffer solutions that reproduce and transmit 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. pH working standards of 2 category are prepared by diluting the quantity of substance with double-distilled water with specific conductivity (UEC) of not more than 2 · 10-4 Sm / m.

pH working standards of 2 category are prepared in accordance with GOST 8.135-2004. Titration standards are contained in plastic bottles. The bottle is leakproof and has a screw cap with a protective ring. Titration standards ST-pH-2 have 11 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 (modification number according to GOST 8.135- 2004) Name of chemical substances, included in titration standards Chemical formulas of substances Weight of quantities of chemical substances, g The concentration of substances, mole / kg рН reproducible value at temperature +25°С
ST-рН-2-1(1) Potassium tetraoxalate dihydrate KH3(C2O4)2·2H2O 25,219 0,1 1,48
ST-рН-2-2(2) Potassium tetraoxalate dihydrate KH3(C2O4)2·2H2O 12,610 0,05 1,65
ST-рН-2-3(4) Potassium hydrotartrate KНC4H4O6 9,50 saturated at temperature +25°С 3,56
ST-рН-2-4(5) Potassium hydrogenphthalate KНC8H4O4 10,120 0,05 4,01
ST-рН-2-5(9)

Potassium phosphate monosubstituted

Sodium phosphate twice-substituted

KH2PO4

Na2HPO4

3,3880

3,5330

0,025

0,025

6,86
ST-рН-2- 6(10)

Potassium phosphate monosubstituted

Sodium phosphate twice-substituted

KH2PO4

Na2HPO4

1,1790

4,3030

0,0087

0,0304

7,41
ST-рН-2- 7(11)

Potassium phosphate monosubstituted

Sodium phosphate twice-substituted

KH2PO4

Na2HPO4

1,3560

5,6564

0,1

0,04

7,43
ST-рН-2- 8(13) Sodium tetraborate decahydrate Na2B4O7·10H2O 3,8064 0,01 9,180
ST-рН-2- 9(14) Sodium tetraborate decahydrate Na2B4O7·10H2O 19,012 0,05 9,180
ST-рН-2- 10(15)

Sodium carbonate

Sodium carbonate acid

Na2CO3

NaHCO3

2,6428

2,0947

0,025

0,025

10,00
ST-рН-2- 11(16) Calcium hydroxide Са(OH)2 1,75 saturated at temperature +20°С 12,43

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