Indicator | pKa | Color change | pH range |
1a | 6.83 | Light yellow to light green | 6.44 - 7.08 |
1b | 7.22 | Light yellow to dark green | 6.59 - 8.18 |
1c | 7.57 | Light violet to dark red | 6.56 - 7.82 |
1d | 6.93 | Light yellow to dark violet | 6.45 - 7.53 |
1e | 7.56 | Yellow to dark green | 6.87 - 8.24 |
1f | 7.34 | Orange to dark violet | 6.55 - 7.78 |
1g | 8.12 | Colorless to light red | 6.79 - 8.34 |
1h | 7.38 | Colorless to red | 7.02 - 7.53 |
1i | 7.47 | Yellow to dark violet | 6.85 - 7.59 |
1j | 7.21 | Light violet to red | 7.24 - 7.78 |
1k | 6.95 | Colorless to blue violet | 6.70 - 7.86 |
3 | 7.64 | Dark orange to light yellow | 7.43 - 8.12 |
4 | 6.86 | Dark red to light yellow | 6.45 - 7.23 |