pH/pOH/[H+]/[OH-] API

Interconverts pH, pOH, [H+] and [OH-] at 25 °C (Kw = 1e-14) from any single input and classifies acidity. Answers 'What is the pH if [H+] = 1e-3?', 'Convert pOH 11 to pH and [OH-]'.

Price$0.04per request

MethodPOST

Route/v1/chemistry/ph-scale

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

chemistryphpohhydrogen-ionhydroxideacid-baselogarithmequilibrium

API URLhttps://x402.hexl.dev/v1/chemistry/ph-scale

Integration docs

Example request

{
  "h": 0.001
}

Example response

{
  "pH": 3,
  "pOH": 11,
  "h": 0.001,
  "oh": 1e-11,
  "classification": "acidic",
  "formula": "pH = -log10[H+]; pH + pOH = 14; [H+][OH-] = 1e-14"
}

Input schema

{
  "type": "object",
  "properties": {
    "pH": {
      "type": "number"
    },
    "pOH": {
      "type": "number"
    },
    "h": {
      "type": "number",
      "examples": [
        0.001
      ]
    },
    "oh": {
      "type": "number"
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}