1. What is Molarity?

Molarity (M) is a unit of concentration representing the number of moles of a solute per liter of solution. It's one of the most commonly used units in chemistry for quantifying solution concentrations.

2. How Does the Calculator Work?

The calculator uses the molarity formula:

Where:

• \( M \) — Molarity (mol/L)
• \( mg/mL \) — Concentration in milligrams per milliliter
• \( MW \) — Molecular weight in grams per mole

Explanation: The formula converts mass concentration (mg/mL) to molar concentration (mol/L) by dividing by the molecular weight of the solute.

3. Importance of Molarity Calculation

Details: Accurate molarity calculations are essential for preparing solutions with precise concentrations, which is crucial in chemical reactions, biological assays, and pharmaceutical preparations.

4. Using the Calculator

Tips: Enter the concentration in mg/mL and the molecular weight in g/mol. Both values must be positive numbers. The result will be in mol/L (Molar).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between molarity and molality?
A: Molarity is moles per liter of solution, while molality is moles per kilogram of solvent. Molarity is temperature-dependent, while molality is not.

Q2: How do I find the molecular weight of a compound?
A: Sum the atomic weights of all atoms in the molecule. For example, water (H₂O) has MW = 2(1.008) + 15.999 = 18.015 g/mol.

Q3: Can I use this for mixtures?
A: This calculator is for single-component solutions. For mixtures, you need to know the concentration of each component separately.

Q4: Why does my result have many decimal places?
A: Molarity calculations often result in small numbers, especially for large molecules. The calculator shows 4 decimal places for precision.

Q5: How do I convert molarity back to mg/mL?
A: Multiply molarity (M) by molecular weight (g/mol) to get g/L, then divide by 1000 to convert to mg/mL.