Table of Contents
pH Calculator
Calculate pH, pOH, [H+], and [OH-] concentrations
Features of pOH calculator
ChemicalTweak tool offers Multiple Calculation Methods
- Calculate from H+/OH- ion concentrations
- Work directly with common acids and bases (HCl, NaOH, CH₃COOH, NH₃, etc.)
- Convert between pH and pOH values
- Handle both strong and weak acids/bases with proper equilibrium calculations
How to Use This Calculator
Method 1: From Acid/Base Solutions
- Select your substance type (Strong Acid, Weak Acid, Strong Base, Weak Base)
- Choose the specific chemical from the dropdown (shows Ka/Kb values automatically)
- Enter concentration and units
- Hit Calculate
Example: For 0.1 M acetic acid solution, select “Weak Acid” → “Acetic acid” → enter “0.1” → select “M”
Method 2: From Ion Concentrations
- Choose H+ or OH- ions
- Enter concentration with appropriate units (M, mM, μM, nM)
- Calculate to get all related values
Method 3: From Known pH/pOH Simply enter the known pH or pOH value to calculate concentrations.
FAQ
1. How to convert molarity to pH?
The Formula to calculate for strong acids, pH = log₁₀(molarity) and for strong bases, pOH = –log₁₀(molarity), then pH = 14 – pOH. For weak acids and bases, you can’t use a direct formula because they don’t fully dissociate. We can use the acid (Ka) or base (Kb) dissociation constant to find [H⁺] or [OH⁻]. Then, calculate pH: pH = –log₁₀[H⁺]
2. How to calculate pH?
There are number of online tools avaliable which can help you to calculate pH such as chemicaltweak online pH calculator
