Solubility of CaSO<sub>4</sub>Phases in Aqueous HCl + CaCl<sub>2</sub>Solutions from 283 K to 353 K
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Bibliographic record
Abstract
Solubilities of calcium sulfate dihydrate, hemihydrate, and anhydrite in concentrated HCl, CaCl 2, and their mixed aqueous solutions were measured by using the classic isothermal dissolution method at the temperature range from (283 to 353) K. The concentration investigated for HCl is up to 12 mol·dm -3 and for CaCl 2 is up to 3.5 mol·dm -3 at room temperature. The solubility of CaSO 4 phases in all cases investigated was found to increase with the temperature increment with the exception of anhydrite in CaCl 2 solutions. In pure HCl media, increasing the acid concentration in the range of (0.0 to 3) mol·dm -3 HCl causes the solubility of CaSO 4 ·2H 2 O or CaSO 4 to increase reaching a maximum value and then decrease gradually with further increasing HCl concentration. In the concentrated range of (8 to 12) mol·dm -3 HCl, the solubility of CaSO 4 · 1 / 2 H 2 O decreases with acid concentration. In HCl + CaCl 2 mixed media, the addition of CaCl 2 causes the solubility of all three phases to decrease due apparently to common ion effect.
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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 | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| 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 it