1. What is Stock Molarity?

Stock molarity (M_stock) is the concentration of a solution expressed as the number of moles of solute per liter of solution. It's calculated from the mass of solute, its molecular weight, and the total volume of the solution.

2. How Does the Calculator Work?

The calculator uses the stock molarity equation:

Where:

• \( M_{stock} \) — Stock molarity (mol/L)
• \( m \) — Mass of solute (g)
• \( MW \) — Molecular weight of solute (g/mol)
• \( V_{stock} \) — Volume of solution (L)

Explanation: The equation converts the mass of solute to moles using its molecular weight, then divides by the solution volume to get concentration.

3. Importance of Stock Molarity

Details: Accurate stock solution preparation is fundamental in chemistry and biology experiments. Proper molarity ensures correct dilutions and reaction stoichiometry.

4. Using the Calculator

Tips: Enter mass in grams, molecular weight in g/mol, and volume in liters. All values must be positive numbers. For best results, use precise measurements.

5. Frequently Asked Questions (FAQ)

Q1: What if my volume is in milliliters?
A: Convert mL to L by dividing by 1000 before entering the value (1 mL = 0.001 L).

Q2: How precise should my measurements be?
A: For most applications, measuring mass to 3-4 significant figures provides sufficient accuracy.

Q3: Does temperature affect molarity?
A: Yes, since volume changes with temperature. For precise work, measure at the temperature you'll be using the solution.

Q4: What's the difference between molarity and molality?
A: Molarity is moles per liter of solution, while molality is moles per kilogram of solvent.

Q5: How do I prepare the solution after calculating?
A: Dissolve the weighed solute in about 80% of the final volume, then carefully add solvent to reach the exact final volume.