Section: 5 | Buffer Solutions Giving Round Values of pH at 25 °C |

How to Cite this Reference

BUFFER SOLUTIONS GIVING ROUND VALUES OF pH AT 25 °C

This table gives a series of buffer solutions A, B, ··· J that produce round values of pH from 1.0 to 13.0. The value of x to be used for each pH value is given. The buffers are:

A	25 mL of 0.2 molar KCl + x mL of 0.2 molar HCl.
B	50 mL of 0.1 molar potassium hydrogen phthalate + x mL of 0.1 molar HCl.
C	50 mL of 0.1 molar potassium hydrogen phthalate + x mL of 0.1 molar NaOH.
D	50 mL of 0.1 molar potassium dihydrogen phosphate + x mL of 0.1 molar NaOH.
E	50 mL of 0.1 molar tris(hydroxymethyl)aminomethane + x mL of 0.1 molar HCl.
F	50 mL of 0.025 molar borax + x mL of 0.1 molar HCl.
G	50 mL of 0.025 molar borax + x mL of 0.1 molar NaOH.
H	50 mL of 0.05 molar sodium bicarbonate + x mL of 0.1 molar NaOH.
I	50 mL of 0.05 molar disodium hydrogen phosphate + x mL of 0.1 molar NaOH.
J	25 mL of 0.2 molar KCl + x mL of 0.2 molar NaOH.

Final volume of mixtures = 100 mL. Borax is sodium tetraborate decahydrate; see Ref 2 for its preparation using NIST Standard Reference Material 187f. The IUPAC name for potassium hydrogen phthalate is potassium 2-carboxybenzoate. Buffer solutions A-D are from Ref 1; E-J are from Ref. 2.

References

Bower, V. E., and Bates, R. G., J. Res. Natl. Bur. Stand., 55, 197, 1955 (A–D). [https://doi.org/10.6028/jres.055.021]
Bates, R. G., and Bower, V. E., Anal. Chem., 28, 1322, 1956 (E–J). [https://doi.org/10.1021/ac60116a029]

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Preparation of Buffer Solutions Giving Round Values of pH at 25 °C
Value of Component x Needed for Each Buffer Solution

A	x	B	x	C	x	D	x	E	x	F	x	G	x	H	x	I	x	J	x
Continued on next page...
1.0	67.0	2.2	49.5	4.1	1.3	5.8	3.6	7.0	46.6	8.0	20.5	9.2	0.9	9.6	5.0	10.9	3.3	12.0	6.0
1.1	52.8	2.3	45.8	4.2	3.0	5.9	4.6	7.1	45.7	8.1	19.7	9.3	3.6	9.7	6.2	11.0	4.1	12.1	8.0
1.2	42.5	2.4	42.2	4.3	4.7	6.0	5.6	7.2	44.7	8.2	18.8	9.4	6.2	9.8	7.6	11.1	5.1	12.2	10.2
1.3	33.6	2.5	38.8	4.4	6.6	6.1	6.8	7.3	43.4	8.3	17.7	9.5	8.8	9.9	9.1	11.2	6.3	12.3	12.8
1.4	26.6	2.6	35.4	4.5	8.7	6.2	8.1	7.4	42.0	8.4	16.6	9.6	11.1	10.0	10.7	11.3	7.6	12.4	16.2
1.5	20.7	2.7	32.1	4.6	11.1	6.3	9.7	7.5	40.3	8.5	15.2	9.7	13.1	10.1	12.2	11.4	9.1	12.5	20.4
1.6	16.2	2.8	28.9	4.7	13.6	6.4	11.6	7.6	38.5	8.6	13.5	9.8	15.0	10.2	13.8	11.5	11.1	12.6	25.6
1.7	13.0	2.9	25.7	4.8	16.5	6.5	13.9	7.7	36.6	8.7	11.6	9.9	16.7	10.3	15.2	11.6	13.5	12.7	32.2
1.8	10.2	3.0	22.3	4.9	19.4	6.6	16.4	7.8	34.5	8.8	9.6	10.0	18.3	10.4	16.5	11.7	16.2	12.8	41.2
1.9	8.1	3.1	18.8	5.0	22.6	6.7	19.3	7.9	32.0	8.9	7.1	10.1	19.5	10.5	17.8	11.8	19.4	12.9	53.0
2.0	6.5	3.2	15.7	5.1	25.5	6.8	22.4	8.0	29.2	9.0	4.6	10.2	20.5	10.6	19.1	11.9	23.0	13.0	66.0
2.1	5.10	3.3	12.9	5.2	28.8	6.9	25.9	8.1	26.2	9.1	2.0	10.3	21.3	10.7	20.2	12.0	26.9
2.2	3.9	3.4	10.4	5.3	31.6	7.0	29.1	8.2	22.9			10.4	22.1	10.8	21.2
		3.5	8.2	5.4	34.1	7.1	32.1	8.3	19.9			10.5	22.7	10.9	22.0
		3.6	6.3	5.5	36.6	7.2	34.7	8.4	17.2			10.6	23.3	11.0	22.7
		3.7	4.5	5.6	38.8	7.3	37.0	8.5	14.7			10.7	23.8
		3.8	2.9	5.7	40.6	7.4	39.1	8.6	12.2			10.8	24.25
		3.9	1.4	5.8	42.3	7.5	40.9	8.7	10.3
		4.0	0.1	5.9	43.7	7.6	42.4	8.8	8.5

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BUFFER SOLUTIONS GIVING ROUND VALUES OF pH AT 25 °C

References