Measurement of Ion Activity Coefficients in Aqueous Solutions of Mixed Electrolyte with a Common Ion: NaNO<sub>3</sub> + KNO<sub>3</sub>, NaCl + KCl, and NaBr + NaCl
Bibliographic record
Abstract
This work reports individual ion activity coefficients in aqueous solutions of mixed 1:1 electrolytes with a common ion for the systems NaNO 3 + KNO 3, NaCl + KCl, and NaCl + NaBr at 298.15 K. These values were obtained from electrode potential measurements of ion-selective-electrodes (ISEs) of the common ion against an Ag−AgCl single-junction reference electrode filled with 4 mol·kg −1 KCl solution saturated with AgCl. For the NaNO 3 + KNO 3 and NaCl + KCl systems, experiments were carried out at cation molal fractions of sodium of 0.75, 0.5, and 0.25, and for the NaCl + NaBr system, experiments were carried out at an anion molal fraction of chloride of 0.5. For NaNO 3 + KNO 3, single ion activity coefficients were obtained up to 2.4 mol·kg −1 total nitrate concentration, and for the NaCl + KCl and NaCl + NaBr systems, up to 4 mol·kg −1 of total chloride and sodium concentrations, respectively. The Henderson equation was used to estimate the value of the liquid−junction potential.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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; 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".