Source: https://guthlabs.ai/docs/instruments/titration-equivalence-point-calculator/implementation/

instrument implementation / implementation-contract

# Titration Equivalence-Point Calculator implementation

A source-bound implementation contract for Titration Equivalence-Point 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**: t4-087

**Effect**: Computation or source lookup only

## Input and validation requirements

The zero measured-titrant-volume input produces a division by zero in the standardized concentration calculation. The specification also does not define stoichiometric branch selection, so assuming the wrong n_a:n_b ratio can produce a factor-of-two error.

## 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": {
    "mode": "standardize_unknown_titrant",
    "known_solution": "acid",
    "C_a_M": 0.1,
    "V_a_L": 0.025,
    "n_a": 1,
    "V_b_L": 0.0246,
    "n_b": 1
  },
  "expected_outputs": {
    "unknown_titrant_concentration_C_b_M": 0.1016260163
  },
  "working": "C_a·V_a·n_a=C_b·V_b·n_b\nC_b=(C_a·V_a·n_a)/(V_b·n_b)\nC_b=(0.1000 mol/L × 0.02500 L × 1)/(0.02460 L × 1)\nC_b=0.002500 mol ÷ 0.02460 L\nC_b=0.1016260163 mol/L ≈ 0.1016 M"
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/titration-equivalence-point-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/titration-equivalence-point-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/titration-equivalence-point-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`