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Convert between [H⁺], pH, pOH and [OH⁻] and classify the acidity.
Results update as you type.
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pH scale is a scale of pH, which is a measure of the acidity of a solution. It is a scale of pH that is used to measure the acidity of a solution. The pH scale is a scale of pH, which is a scale of the acidity of a solution. The pH scale is a scale of pH, which is a scale of the acidity of a solution. The pH scale is a scale of pH, which is a scale of the acidity of a solution. The pH scale is a scale of pH, which is a scale of pH, which is a scale of pH, which is a scale of pH.As a result, pH = pH + pOH = 14. The pH scale is a scale of pH.As
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QPrintPreviewDialog
pH shine lamba mai lamba 10 na adadin ion hydrogen, pH = −log10[H⁺]. Adadin 1×10⁻⁷ mol/L yana samar da pH mai daraja 7.
QSoftKeyManager
At 25 °C, pH + pOH = 14. So a solution of pH 3 has pOH 11, and its hydroxide concentration is [OH⁻] = 10⁻¹¹ mol/L.
QPrintPreviewDialog
Below 7 is acidic, exactly 7 is neutral, and above 7 is basic (alkaline). The scale usually runs 0–14, though very strong acids or bases can fall slightly outside it. The calculator classifies your value as acidic, neutral or basic.
QSoftKeyManager
Hydrogen-ion concentrations span many orders of magnitude, so a log scale keeps the numbers manageable. Each unit is a tenfold change: pH 4 is ten times more acidic than pH 5 and a hundred times more than pH 6.
Ta yaya zan samu [H⁺] daga darajar pH?
Invert the definition: [H⁺] = 10^(−pH). A pH of 3 gives [H⁺] = 10⁻³ = 0.001 mol/L. Choose "from a pH value" mode and the calculator returns the concentration for you.
QPrintPreviewDialog
Yes. The neutral point of 7 and the pH + pOH = 14 rule hold at 25 °C; at higher temperatures water ionises more, so neutral pH drops below 7 and the sum falls slightly. This tool uses the standard 25 °C values.
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[Translation temporarily unavailable. Please try again.] Anything you omit uses the same default this page is pre-filled with; an unknown parameter is a 400, never a silent zero. [Translation temporarily unavailable. Please try again.] →
Endpoint
GET https://calculator.free/api/v1/ph/curl
curl "https://calculator.free/api/v1/ph/?mode=conc&conc=1e-07&phval=7"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/ph/?" + new URLSearchParams({
"mode": "conc",
"conc": "0.0000001",
"phval": "7"
}));
const data = await r.json();
console.log(data.results);Results are estimates for general guidance only, not financial, medical or tax advice.