pH 7 Standard Buffer Solution has a pH of 7.00 +/-0.01 at 25 dgrees C. pH Buffer 7 is a mixture of Potassium and Sodium Phosphates with a mold inhibitor. The 7 buffer has a blue color to distinguish it from other buffers. The following Table gives the pH value of this buffer at various temperatures.
| DEGREE-C | DEGREE-F | pH |
|---|---|---|
| 0 | 32 | 7.12 |
| 5 | 41 | 7.09 |
| 10 | 50 | 7.06 |
| 15 | 59 | 7.04 |
| 20 | 68 | 7.02 |
| 25 | 77 | 7.00 |
| 30 | 86 | 6.99 |
| 35 | 95 | 6.98 |
| 40 | 104 | 6.97 |
| 45 | 113 | 6.97 |
| 50 | 122 | 6.98 |
| 55 | 131 | 6.98 |
| 60 | 140 | 6.98 |
| 70 | 158 | 6.99 |
| 80 | 176 | 7.00 |
| 90 | 194 | 7.02 |
pH 4 Standard Buffer Solution has a pH of 4.01 +/- 0.01 at 25 degrees C. This buffer solution is composed of Potassium Acid Phthalate, Primary Standard, and a mold inhibitor. A red dye has been added to distinguish it from other buffers. Its value as a function of temperature is shown below:
| DEGREE-C | DEGREE-F | pH |
|---|---|---|
| 0 | 32 | 4.01 |
| 5 | 41 | 4.00 |
| 10 | 50 | 4.00 |
| 15 | 59 | 4.00 |
| 20 | 68 | 4.00 |
| 25 | 77 | 4.01 |
| 30 | 86 | 4.01 |
| 35 | 95 | 4.02 |
| 40 | 104 | 4.03 |
| 45 | 113 | 4.04 |
| 50 | 122 | 4.06 |
| 55 | 131 | 4.07 |
| 60 | 140 | 4.09 |
| 70 | 158 | 4.12 |
| 80 | 176 | 4.16 |
| 90 | 194 | 4.20 |
pH 10 Standard Buffer Solution has a pH of 10.00 +/- 0.01 at 25 degrees C. This buffer solution is composed of Sodium Carbonate and Sodium bicarbonate, and a mold inhibitor. A yellow dye has been added to distinguish it from other buffers. Its value as a function of temperature is shown below:
| DEGREE-C | DEGREE-F | pH |
|---|---|---|
| 0 | 32 | 10.31 |
| 5 | 41 | 10.24 |
| 10 | 50 | 10.17 |
| 15 | 59 | 10.11 |
| 20 | 68 | 10.05 |
| 25 | 77 | 10.00 |
| 30 | 86 | 9.95 |
| 35 | 95 | 9.92 |
| 40 | 104 | 9.88 |
| 45 | 113 | 9.85 |
| 50 | 122 | 9.82 |
| 55 | 131 | 9.80 |
| 60 | 140 | 9.77 |
| 70 | 158 | 9.73 |
| 80 | 176 | 9.69 |
| 90 | 194 | 9.66 |