Source: https://guthlabs.ai/docs/instruments/osmotic-pressure-calculator-van-t-hoff/implementation/

instrument implementation / implementation-contract

# Osmotic Pressure Calculator (van't Hoff) implementation

A source-bound implementation contract for Osmotic Pressure Calculator (van't Hoff); 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**: t5-193

**Effect**: Computation or source lookup only

## Input and validation requirements

The extreme finite-looking inputs produce 8.2057e614 atm mathematically, which overflows plain JavaScript Number arithmetic to Infinity. The unspecified temperature unit also permits a 25 °C versus 25 K interpretation that differs by more than an order of magnitude.

## 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": {
    "molarity_M": 0.15,
    "van_t_Hoff_factor_i": 2,
    "temperature_K": 298.15
  },
  "expected_outputs": {
    "osmotic_pressure_atm": 7.339588,
    "osmotic_pressure_kPa": 743.683791
  },
  "working": "π = iMRT = 2 × 0.15 mol/L × 0.082057 L·atm·mol⁻¹·K⁻¹ × 298.15 K. First, 2 × 0.15 = 0.30. Then, 0.30 × 0.082057 = 0.0246171. Then, 0.0246171 × 298.15 = 7.339588365 atm. Convert: 7.339588365 × 101.325 = 743.6837911 kPa. Rounded outputs: 7.339588 atm and 743.683791 kPa."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/osmotic-pressure-calculator-van-t-hoff/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/osmotic-pressure-calculator-van-t-hoff/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/osmotic-pressure-calculator-van-t-hoff/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-tranche5/tranche5-results.json`