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Chemistry calculator
Chemistry calculatorChemistry
pH Β· Molarity Β· Ideal Gas Β· Dilution Β· Thermodynamics
pH = βlogββ[HβΊ] | pOH = βlogββ[OHβ»] | pH + pOH = 14 (at 25Β°C)
About the Chemistry calculator
A set of common chemistry calculations in one place: pH and pOH, molarity, the ideal gas law, dilution, thermodynamics and molar mass.
How to use the Chemistry calculator
- Choose a tab: pH / pOH, Molarity, Ideal Gas, Dilution, Thermodynamics or Molar Mass.
- Select what you are calculating from and solving for, and enter the values.
- Press Calculate.
Formula and method
pH = βlogββ[HβΊ] and pH + pOH = 14 (at 25 Β°C). Molarity M = n Γ· V. Ideal gas: PV = nRT. Dilution: MβVβ = MβVβ.
Worked example
A solution with [HβΊ] = 0.001 mol/L has a pH of 3. Diluting 50 mL of 2 M solution to 200 mL gives 2 Γ 50 Γ· 200 = 0.5 M.
Tips
- Keep units consistent (litres, moles, kelvin).
- Enter molar mass formulas with correct capitals, such as Ca(OH)2.
Frequently Asked Questions
A pH below 7 is acidic, 7 is neutral and above 7 is basic (alkaline).