Our pH Calculator makes finding the pH of any acid or base solution super easy. This free tool helps you solve chemistry problems quickly and accurately. pH stands for “potential of Hydrogen” or “power of Hydrogen.” It tells us how acidic or basic a solution is.
pH Calculator
How Ph Calculator Works
Our calculator uses the formula: pH = -log[H⁺]
Don’t worry about memorizing this! Just understand:
- We measure the concentration of hydrogen ions
- Use math (logarithm) to convert to pH scale
- Our calculator does all the math for you
Using the Calculator: Step-by-Step Guide
Follow the given steps to use PH Calculator:
Step 1: Choose What to Calculate
Your calculator has a dropdown menu. Select “pH” to find the pH value.
Step 2: Enter Your Concentration
Type the concentration of your solution in the number box.
Units Available:
- M (Molar): Most common in chemistry class
- mM (Millimolar): 1/1000 of a molar
- μM (Micromolar): 1/1,000,000 of a molar
- nM (Nanomolar): Very small concentrations
Step 3: Enter Chemical Name or Formula
Type your chemical in the text box. Examples:
- “HCl” (hydrochloric acid)
- “NaOH” (sodium hydroxide)
- “Hydrochloric acid”
- “Sodium hydroxide”
Step 4: Click Calculate
Hit the “Calculate” button and get your answer instantly!
Real Example: Finding pH of HCl
Let’s calculate the pH of a 0.01 M hydrochloric acid solution:
Given Information:
- Chemical: HCl (hydrochloric acid)
- Concentration: 0.01 M
- HCl is a strong acid
Using Our Calculator:
- To Calculate: Select “pH”
- Enter Concentration: 0.01
- Select Units: M
- Enter Chemical: HCl
- Click Calculate
Result: pH = 2 (acidic, as expected!)
Common PH Values
Everyday Items:
- Lemon juice: pH 2
- Coffee: pH 5
- Pure water: pH 7
- Baking soda: pH 9
- Soap: pH 10
Laboratory Solutions:
- 1 M HCl: pH 0
- 0.1 M HCl: pH 1
- 0.01 M HCl: pH 2
- 0.01 M NaOH: pH 12
- 0.1 M NaOH: pH 13
Frequently Asked Questions
Why does the pH scale only go from 0 to 14?
This range covers the most common solutions, but extreme acids/bases can go beyond these limits.
What if I get a negative pH value?
Negative pH is possible with very concentrated strong acids! It means extremely acidic.
Why is pure water pH 7?
Water molecules split into equal amounts of H⁺ and OH⁻ ions, creating perfect balance.