Van't Hoff Factor Estimator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-195

Effect

Computation or source lookup only

Input and validation requirements

The zero expected nonelectrolyte temperature difference creates an undefined division, and an undocumented signed-versus-magnitude ΔT convention can produce a negative van't Hoff factor and nonsensical negative dissociation. The branch probe also requires explicit selection between association and dissociation formulas.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "solute": "NaCl",
    "behavior": "dissociation",
    "measured_delta_T": "1.50 K",
    "expected_nonelectrolyte_delta_T": "1.00 K",
    "ions_per_formula_unit": 2
  },
  "expected_outputs": {
    "i": 1.5,
    "i_ideal": 2,
    "percent_dissociation": 50,
    "percent_association": null
  },
  "working": "i = 1.50 / 1.00 = 1.50. For NaCl, ν = 2, so i_ideal = 2. Percent dissociation = 100 × (1.50 - 1) / (2 - 1) = 100 × 0.50 / 1 = 50%."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json