Molarity / Solution Prep 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

t4-086

Effect

Computation or source lookup only

Input and validation requirements

The specification permits a zero-concentration stock input that produces an undefined stock-volume division, and its mixed L/mL and %w/v workflows can produce a factor-of-1000 or formula-mode error unless units and concentration mode are explicitly enforced.

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": {
    "target_molarity_M": 0.15,
    "final_volume_L": 0.5,
    "molecular_weight_g_per_mol": 58.44
  },
  "expected_outputs": {
    "mass_g": 4.383
  },
  "working": "Moles = 0.15 mol/L × 0.500 L = 0.0750 mol. Mass = 0.0750 mol × 58.44 g/mol = 4.383 g."
}

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