Initial Rate Determination of the Crystal Violet – Hydroxyl Ion Reaction
Bibliographic record
Abstract
The customary colorimetric initial rate procedure for determining kinetic reactant orders involves a significant determinate error arising from the system setup time delay before the first absorbance value is recorded after an earlier combination of the reactant solutions initiates the reaction. Exemplified in the reaction between crystal violet and hydroxyl ion, a modified colorimetric experimental procedure that virtually eliminates this error source is described in which absorbance measurement is initiated from the moment that the reactant solutions are combined. A data interpolation procedure is then applied to the absorbance versus reaction time relationship to fill in the interval between the known initial value of the absorbance of the test solution at the reaction start and the first value recorded by the colorimeter following the system setup delay. To investigate the effectiveness of this interpolation step in reducing experimental error, the colorimetric procedure is repeated in a colorimetric test system modified to operate in a flowthrough mode to deliver absorbance values from close to the moment at which the reactant solutions are combined.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.005 | 0.012 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.003 | 0.001 |
| Research integrity | 0.001 | 0.004 |
| Insufficient payload (model declined to judge) | 0.006 | 0.004 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".