| [Cr3+] mol/L | Regression equation | Initial rate reaction (k) | logCr3+ | Logk |
| 0.0011 | y = −0.0008x + 0.1023 R2 = 0.9552 | 8 × 10−3 | −2.96 | −3.09 |
| 0.004 | y = −0.0075x + 0.3375 R2 = 0.9549 | 7.5 × 10−3 | −2.40 | −2.12 |
| 0.008 | y = −0.0078x + 0.6436 R2 = 0.9295 | 7.8 × 10−3 | −2.10 | −2.10 |
| 0.012 | y = −0.0087x + 0.9542 R2 = 0.892 | 8.7 × 10−3 | −1.92 | −2.06 |
| 0.016 | y = −0.0142x + 1.1707 R2 = 0.9886 | 1.42 × 10−2 | −1.80 | −1.84 |