pH and pOH for a strong or weak acid or base, a hydrogen-ion concentration, or a
pH and pOH for a strong or weak acid or base, a hydrogen-ion concentration, or a buffer (Henderson-Hasselbalch).
Answeringour last check, 2026-10-21
1 of 1checks answered this week
1243 msmedian answer time
$0.02listed price per call
$0.02price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://chemistry-calc.x402tookit.com/ph-calc
| Category | Everything else |
|---|---|
| Provider host | chemistry-calc.x402tookit.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | valid payment request | 402 | $0.02 | 1243 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"concentration": 0.1,
"ka": 1.8e-05,
"mode": "weak-acid"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"acidConc": {
"description": "Buffer weak-acid concentration (HA)",
"type": "number"
},
"baseConc": {
"description": "Buffer conjugate-base concentration (A-)",
"type": "number"
},
"concentration": {
"description": "Molarity of the acid or base",
"type": "number"
},
"ka": {
"description": "Acid dissociation constant (weak-acid, buffer uses pKa)",
"type": "number"
},
"kb": {
"description": "Base dissociation constant (weak-base)",
"type": "number"
},
"mode": {
"description": "ph (convert a pH), h-conc, strong-acid, strong-base, weak-acid, weak-base or buffer",
"type": "string"
},
"pka": {
"description": "pKa for a buffer",
"type": "number"
},
"protons": {
"description": "Ionisable H+ or OH- per formula unit for strong acids and bases (default 1)",
"type": "integer"
},
"value": {
"description": "pH value (mode ph) or hydrogen-ion molarity (mode h-conc)",
"type": "number"
}
},
"required": [
"mode"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"description": {
"type": [
"null",
"string"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"hydrogenIonMolar": {
"type": [
"null",
"number"
]
},
"hydroxideIonMolar": {
"type": [
"null",
"number"
]
},
"method": {
"type": [
"null",
"string"
]
},
"mode": {
"type": [
"null",
"string"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"pH": {
"type": [
"null",
"number"
]
},
"pOH": {
"type": [
"null",
"number"
]
},
"percentIonised": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}