🧪 Molarity Calculator & Molarity Formula: Simplify Your Chemistry Calculations ⚗️
Calculate molarity, dilution, and concentration conversions with our free online tool. Perfect for chemistry students and professionals!
🧮 Molarity Calculator
Use our free online molarity calculator to determine the concentration of your chemical solutions quickly and accurately.
Basic Molarity Calculator
Molarity Result
The molarity of your solution is:
Molarity (M) = moles of solute / liters of solution
Dilution Calculator
🔍 What is Molarity?
Molarity (M) is one of the most commonly used units of concentration in chemistry. It represents the number of moles of a solute dissolved in one liter of solution. The molarity calculator helps you determine this important value quickly.
The formal definition of molarity is:
Key Features of Molarity:
- Expressed in moles per liter (mol/L or M)
- Temperature-dependent (volume changes with temperature)
- Widely used in laboratory preparations
- Essential for stoichiometric calculations
Molarity of Pure Water
The molarity of pure water is an interesting case. Since water has a density of 1 g/mL at 4°C, and its molar mass is 18.015 g/mol, we can calculate:
📝 Molarity Formula and Calculations
The molarity formula is fundamental to solution chemistry. Here’s how to use it:
Basic Molarity Formula
Where:
M = Molarity (mol/L or M)
n = moles of solute (mol)
V = volume of solution (L)
Relation Between Molarity and Normality
Normality (N) is another concentration unit related to molarity:
Where n = number of equivalents per mole
Difference Between Molarity and Molality
| Characteristic | Molarity (M) | Molality (m) |
|---|---|---|
| Definition | Moles per liter of solution | Moles per kilogram of solvent |
| Temperature Dependence | Changes with temperature | Independent of temperature |
| Units | mol/L | mol/kg |
🧪 Molarity Calculation Examples
Let’s walk through some practical examples of molarity calculations:
Example 1: Basic Molarity Calculation
Calculate the molarity of a solution containing 0.5 moles of NaCl in 2 liters of solution:
Example 2: From Mass to Molarity
What is the molarity of a solution made by dissolving 58.44 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 500 mL of solution?
2. Convert volume to liters: 500 mL = 0.500 L
3. Calculate molarity: M = 1.00 mol / 0.500 L = 2.00 M
Example 3: Dilution Calculation
How would you prepare 250 mL of 0.1 M HCl from a 1 M HCl stock solution?
(1 M)(V₁) = (0.1 M)(0.250 L)
V₁ = (0.1 M × 0.250 L) / 1 M = 0.025 L = 25 mL
Procedure: Take 25 mL of 1 M HCl and dilute to 250 mL with water.
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