Solubility of NaHCO<sub>3</sub> and NH<sub>4</sub>HCO<sub>3</sub> in the Relevant Media and Prediction of High-Pressure Phase Equilibria for the NH<sub>3</sub>–CO<sub>2</sub>–NaCl–H<sub>2</sub>O System
Bibliographic record
Abstract
The solubility of NaHCO 3 was determined in the NH 4 + –Na + –CO 3 2– –HCO 3 – –Cl – –H 2 O system with the concentration up to 6 mol·kg –1 by a dynamic method from 283.15 to 333.15 K. It was found that the solubility of NaHCO 3 decreases with increasing concentration of Na 2 CO 3, NH 4 HCO 3, or NaCl. A speciation-based model was developed with mixed-solvent electrolyte interaction parameters newly obtained by regressing both the experimental and literature solubility data. The average relative deviations are less than 5.0%. The new model is able to predict the solubility of NaHCO 3 at high pressures up to 6.0 MPa for the NH 3 –CO 2 –NaCl–H 2 O system at 313.15 and 323.15 K. This work can provide a theoretical basis for producing Na 2 CO 3 with a better crystal form and higher productivity in the carbonation process.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.005 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.002 |
| Open science | 0.004 | 0.002 |
| Research integrity | 0.001 | 0.004 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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; both teacher heads agree on what is shown here.
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".