Molarity Calculator mechanism

Model scope

NEEDS_REVIEW because the formula is standard but volume-unit handling, mass/molar-mass unit compatibility, formula-parser scope, atomic-weight-table selection, and behavior when both mass and moles are supplied are unspecified.

• C=n/V is the standard molarity formula only when V is the final solution volume expressed in liters.
• n=mass/M is correct only when mass and molar mass use compatible units, such as grams and grams per mole.
• The specification does not define how a supplied chemical formula is parsed, including hydrates, parentheses, charges, or atomic-weight precision/version.
• The specification does not define precedence or validation when both mass and moles are supplied.

Units and conventions

• Molarity output is in mol/L.
• Volume must be converted to liters before applying C=n/V; 1 L = 1000 mL.
• If mass is supplied in grams, molar mass must be in g/mol.
• The volume means final solution volume, not the volume of solvent used.
• Formula-derived molar masses depend on the selected atomic-weights table and its precision.

Inspectable vector

One of 4 source-bound review vectors:

{
  "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."
}

Failure boundary

BREAK_CLAIMED · SELF_FLAGGED

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.

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
• BOUNDARY_HAZARD_CATALOG.json