Source: https://guthlabs.ai/docs/instruments/rate-law-reaction-order-determiner/implementation/

instrument implementation / implementation-contract

# Rate Law / Reaction-Order Determiner implementation

A source-bound implementation contract for Rate Law / Reaction-Order Determiner; 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**: t6-114

**Effect**: Computation or source lookup only

## Input and validation requirements

The instrument has exposed invalid-input hazards at zero concentration and zero initial rate, where the logarithm formula is undefined or a ratio divides by zero. It also has a sign-convention hazard that can produce a negative rate constant if signed d[A]/dt values are treated as positive reaction rates.

## 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": {
    "reactants": [
      "A"
    ],
    "trials": [
      {
        "A": "0.100 M",
        "initial_rate": "0.00200 M/s"
      },
      {
        "A": "0.200 M",
        "initial_rate": "0.00800 M/s"
      }
    ]
  },
  "expected_outputs": {
    "order_A": 2,
    "overall_order": 2,
    "rate_constant": "0.200 M^-1 s^-1",
    "rate_law": "rate = (0.200 M^-1 s^-1)[A]^2"
  },
  "working": "rate2/rate1 = 0.00800/0.00200 = 4.000.  [A]2/[A]1 = 0.200/0.100 = 2.000.  Therefore m = ln(4.000)/ln(2.000) = 2.00000.  k = rate1/[A]1^2 = 0.00200/(0.100)^2 = 0.00200/0.0100 = 0.200 M^-1 s^-1.  Overall order = 2."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/rate-law-reaction-order-determiner/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/rate-law-reaction-order-determiner/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/rate-law-reaction-order-determiner/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`