Source: https://guthlabs.ai/docs/instruments/nernst-equation-calculator/implementation/

instrument implementation / implementation-contract

# Nernst Equation Calculator implementation

A source-bound implementation contract for Nernst Equation 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**: t4-265

**Effect**: Computation or source lookup only

## Input and validation requirements

The input n=0 produces division by zero in the Nernst correction term, so the calculator must reject it rather than return a numeric potential. The specification does not state an explicit validation rule for this case.

## 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": {
    "E°_V": 1.1,
    "n": 2,
    "Q": 0.01,
    "T_K": 298.15,
    "formula": "E=E°-(RT/nF)ln Q"
  },
  "expected_outputs": {
    "E_V": 1.15916
  },
  "working": "R T/F = (8.314462618 J mol^-1 K^-1 × 298.15 K)/(96485 C mol^-1) = 0.02569267 V. Therefore RT/(nF)=0.02569267/2=0.01284633 V. ln(0.01)=-4.60517019. E=1.10-(0.01284633×-4.60517019)=1.10+0.05915955=1.15915955 V, approximately 1.15916 V."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/nernst-equation-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/nernst-equation-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/nernst-equation-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-tranche4/tranche4-results.json`