Molarity 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

t2-039

Effect

Computation or source lookup only

Input and validation requirements

A zero-volume input produces an undefined division and must be rejected. A volume supplied in milliliters also produces a factor-of-1000 error if the calculator assumes the numeric value is already in liters without explicit conversion.

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": {
    "mode": "mass",
    "mass_g": 5.844,
    "molar_mass_g_per_mol": 58.44,
    "solution_volume_L": 0.5
  },
  "expected_outputs": {
    "molarity_mol_per_L": 0.2
  },
  "working": "n = mass / M = 5.844 g / 58.44 g/mol = 0.100 mol. C = n / V = 0.100 mol / 0.500 L = 0.200 mol/L."
}

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-tranche2/tranche2-results.json