Source: https://guthlabs.ai/docs/instruments/ksp-solubility-calculator/implementation/

instrument implementation / implementation-contract

# Ksp Solubility Calculator implementation

A source-bound implementation contract for Ksp Solubility Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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

[01**Overview**](<https://guthlabs.ai/docs/instruments/ksp-solubility-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/ksp-solubility-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/ksp-solubility-calculator/qualification/>)

## 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`