Molarity Calculator

Inspectable records

Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Area

Chemistry & Materials

Tranche

tranche-2

Evidence ID

t2-039

Ledger rows

1

No ledger note is attached.

Review findings

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.

Formula and scope findings

• 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.

Unit assumptions

• 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.

Boundary hardening

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.

Errata and corrections

No applied erratum is attached to this unique-name record.

Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

{
  "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."
}

Related workflows

No source-defined multi-instrument workflow membership is recorded.

Sources and evidence

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

• VERIFIED_LEDGER.json · VERIFIED_CLEAN
• evidence-tranche2/tranche2-results.json
• BOUNDARY_HAZARD_CATALOG.json