Ksp Solubility 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

t6-068

Effect

Computation or source lookup only

Input and validation requirements

The negative-Ksp vector must be rejected because the real solubility formula has a negative square-root argument. The specification also leaves unit interpretation and the distinction between free-ion and total common-ion concentration insufficiently explicit, creating possible incorrect results if the interface accepts an unqualified numeric common-ion value.

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": {
    "salt": "AgCl",
    "x": 1,
    "y": 1,
    "Ksp": 1.8e-10,
    "common_ion": null,
    "molar_mass_g_per_mol": 143.321
  },
  "expected_outputs": {
    "molar_solubility_s_M": 0.00001341640786,
    "solubility_g_per_L": 0.001922852991
  },
  "working": "AgCl ⇌ Ag+ + Cl−, so [Ag+]=s and [Cl−]=s. Ksp=s^2. s=sqrt(1.8×10^−10)=sqrt(1.8)×10^−5=1.341640786×10^−5 M. g/L=s×M=1.341640786×10^−5×143.321=1.922852991×10^−3 g/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-tranche6/tranche6-results.json