Molality Calculator 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

t4-003

Effect

Computation or source lookup only

Input and validation requirements

The calculator has an undefined result when solvent mass is zero, should reject nonpositive solvent masses, and can produce a 1000-fold discrepancy when the solvent-mass unit is not specified.

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_moles": 0.5,
    "solvent_mass_kg": 2
  },
  "expected_outputs": {
    "molality_mol_per_kg": 0.25
  },
  "working": "m = n_solute / kg_solvent\nm = 0.500 mol / 2.000 kg\nm = 0.250 mol/kg"
}

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