Math & Numbers

pH↔Hydrogen Ion Concentration Converter ([H⁺] = 10^(−pH))

Convert pH ↔ [H⁺] in mol/L, mmol/L, µmol/L or nmol/L with the full unit table — pH 7.40 ↔ 39.8 nmol/L.

json· JSON resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/ph-to-hydrogen-ion' \
  -H 'Content-Type: application/json' \
  -d '{"inputQuantity":"ph","value":7.4,"concUnit":"nM","decimalPlaces":2}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/ph-to-hydrogen-ion

Parameters

Name	Type	Required	Description
inputQuantity	select	Yes	Whether the entered value is a pH or a hydrogen ion concentration.
value	number	Yes	The pH value (−3 to 16), or the concentration in the selected unit.
concUnit	select	Yes	Unit of the entered (or reported) hydrogen ion concentration.
decimalPlaces	number	No	—

Response format

JSON result

JSON

{
  "key": {...},
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-ph-to-hydrogen-ion": {
      "name": "ph-to-hydrogen-ion",
      "description": "Convert pH ↔ [H⁺] in mol/L, mmol/L, µmol/L or nmol/L with the full unit table — pH 7.40 ↔ 39.8 nmol/L.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=ph-to-hydrogen-ion",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "ph-to-hydrogen-ion",
    "arguments": {
  "inputQuantity": "ph",
  "value": 7.4,
  "concUnit": "nM",
  "decimalPlaces": 2
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

Browse tools Open tool

Name

Type

Required

Description

inputQuantity

select

Yes

Whether the entered value is a pH or a hydrogen ion concentration.

value

number

Yes

The pH value (−3 to 16), or the concentration in the selected unit.

concUnit

select

Yes

Unit of the entered (or reported) hydrogen ion concentration.

decimalPlaces

number

—

{ "mcpServers": { "elysiatools-ph-to-hydrogen-ion": { "name": "ph-to-hydrogen-ion", "description": "Convert pH ↔ [H⁺] in mol/L, mmol/L, µmol/L or nmol/L with the full unit table — pH 7.40 ↔ 39.8 nmol/L.", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=ph-to-hydrogen-ion", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "ph-to-hydrogen-ion", "arguments": { "inputQuantity": "ph", "value": 7.4, "concUnit": "nM", "decimalPlaces": 2 } } }