Home Developers Capabilities chemistry.acid_base.henderson_hasselbalch

Core capability

chemistry.acid_base.henderson_hasselbalch

Buffer pH = pKa + log10([A−]/[HA]). Accepts pKa or Ka. Not ICE and not pH = −log10[H+]. (calculation_version 1.0.0)

Open calculator Evidence Evidence JSON REST API MCP docs Review policy

Trust

Review-policy: engine tested — automated tests, sources, version lock, and evidence published. Supplemental to CVP; not Domain Expert Review. See CVP and Review policy.

Tier
Engine tested — catalog token engine_tested
Calculation version
1.0.0
Evidence tests
11/11 calculation tests · golden 1/1 · boundary 5/5 · property 5/5
Engine tested
Yes
Source checked
Yes
Supplemental domain review
Not performed
Named expert review
Not performed
Version lock
Supported (409 VERSION_MISMATCH)
Artifact consistency
Build verified · 1.0.0 (workspace artifacts agree)
Production attestation
Embedded snapshot: unpublished · Build schema 1.0.0 ready · Semantic contract ✓ · Attestation report not published on origin · Live production status PASS (0 stale; 164 CURRENT) @ 2026-09-16T06:44:24.909Z
Semantic contract
PASS
Evidence attested at
2026-09-16T06:44:24.203Z
Last production check
2026-09-16T06:44:24.203Z
Public / cache
—
Origin
—

Call this capability

Human page, REST, and MCP share the same engine and calculation_version. Build verified hashes workspace artifacts only. After deploy, attest:production GETs canonical URLs twice — the public/cached view an Agent actually hits, and origin — including every /capabilities/{id} HTML page. Public Capability HTML version must match catalog before production attestation passes. Live Trust rows above fetch /.well-known/calculatorx-production-attestation.json and the output schema const. Build hashes: release integrity. That proves currently published page / engine / schema / evidence / MCP agree — not that a historical version is independently immutable. Reference Calculation Standard — Production surface contract 4/4.

Tool id
henderson-hasselbalch
Engine
henderson-hasselbalch
REST
POST /api/v1/calc/henderson-hasselbalch
MCP
execute_calculation with capability_id: "chemistry.acid_base.henderson_hasselbalch"
Agent input schema
Canonical (MCP / Agent)
Output schema
JSON Schema (latest)
Versioned input schema
Immutable pin (1.0.0)
Versioned output schema
Immutable pin (1.0.0)

Limitations

Do not use outside this declared scope.

Try with an agent

Inspect this capability via same-origin MCP, then call execute_calculation.

curl -sS -X POST 'https://www.calculatorx.com/mcp' \
  -H 'Content-Type: application/json' \
  -H 'MCP-Protocol-Version: 2026-07-28' \
  -H 'Mcp-Method: tools/call' \
  -H 'Mcp-Name: inspect_capability' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"inspect_capability","arguments":{"capability_id":"chemistry.acid_base.henderson_hasselbalch"}}}'

Inspect the trust tier and required assurance level before execution. Pin calculation_version (1.0.0) when reproducibility matters. Full protocol notes: MCP docs.