実用

pH Calculator

⚗️pH計算機

H⁺ concentration (mol/L)

🌐

Detailed Guide Coming Soon

We're working on a comprehensive educational guide for the pH Calculator in your language. The content below is shown in English.

とは何か pH Calculator?

▾

pH is a logarithmic scale measuring the acidity or alkalinity of a solution, ranging from 0 (highly acidic) to 14 (highly alkaline), with 7 being neutral (pure water at 25°C). Each unit represents a 10× change in hydrogen ion concentration.

PrimeCalcPro provides professional-grade tools trusted by businesses and academics.

公式

▾

f(x)pH = −log₁₀[H⁺] where [H⁺] is the hydrogen ion concentration in mol/L

変数の説明

▾

記号	名前	単位	説明
H	10^(−pH)	—	10^(−pH)
L	L value	—	Variable used in the calculation

方法 pH Calculator

▾

1pH = −log₁₀[H⁺] where [H⁺] is the hydrogen ion concentration in mol/L
2[H⁺] = 10^(−pH)
3pOH = 14 − pH (at 25°C)
4Acidic: pH < 7 | Neutral: pH = 7 | Alkaline (basic): pH > 7

解いた例

▾

例 1

入力:[H⁺] = 0.001 mol/L

結果:pH = 3

−log₁₀(10⁻³) = 3. Acidic (vinegar level)

例 2

入力:pH = 11

結果:[H⁺] = 10⁻¹¹ mol/L

Strongly alkaline — bleach, ammonia

実際の応用

▾

🏗️

Academic homework and exam preparation

🔬

Engineering and architecture calculations

📊

Everyday measurement tasks around the home

Common pH Values

▾

Substance	pH	Category
Battery acid	0	Extremely acidic
Gastric acid (stomach)	1–2	Very acidic
Vinegar / lemon juice	2–3	Acidic
Coffee	5	Mildly acidic
Pure water	7	Neutral
Baking soda	9	Mildly alkaline
Bleach	12	Strongly alkaline

よくある質問

▾

What is Ph?

How accurate is the Ph calculator?

The calculator uses the standard published formula for ph. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Ph calculator use?

This calculator works with inches, Celsius. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Ph calculator use?

The core formula is: pH = −log₁₀[H⁺] where [H⁺] is the hydrogen ion concentration in mol/L. Each step in the calculation is shown so you can verify the result manually.

参考文献

情報提供のみを目的としています。このツールは専門的な医学的助言、診断、治療の代わりにはなりません。必ず資格を持つ医療専門家にご相談ください。

比較する

⇄

pH vs pOH

Mathematically verified

Reviewed October 2026

Our methodology

Get Weekly Math Tips

Join 12,000+ subscribers who get calculator tips every week.

🔒

100% 無料

登録不要

✓

正確

検証済み数式

⚡

即座

即座に結果を表示

📱

モバイル対応

全デバイス対応