Math & Numbers

pH & Buffer Calculator

Calculate buffer solution pH with the Henderson-Hasselbalch equation, or find the acid/base ratio needed for a target pH.

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-buffer-calculator' \
  -H 'Content-Type: application/json' \
  -d '{"mode":"find-ph","bufferSystem":"phosphate","pKa":7.21,"acidConc":0.1,"baseConc":0.1,"targetPh":7.4,"totalConc":0.1,"temperature":25,"decimalPlaces":3}'

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-buffer-calculator

Parameters

Name	Type	Required	Description
mode	select	No	—
bufferSystem	select	No	—
pKa	number	No	Required for Custom buffer; auto-filled for presets (you can still override).
acidConc	number	No	Concentration of the weak acid (protonated) form.
baseConc	number	No	Concentration of the conjugate base (deprotonated) form.

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-buffer-calculator": {
      "name": "ph-buffer-calculator",
      "description": "Calculate buffer solution pH with the Henderson-Hasselbalch equation, or find the acid/base ratio needed for a target pH.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=ph-buffer-calculator",
      "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-buffer-calculator",
    "arguments": {
  "mode": "find-ph",
  "bufferSystem": "phosphate",
  "pKa": 7.21,
  "acidConc": 0.1,
  "baseConc": 0.1,
  "targetPh": 7.4,
  "totalConc": 0.1,
  "temperature": 25,
  "decimalPlaces": 3
}
  }
}

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]

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