Tocris Molarity Calculator

If you've ever struggled to prepare a solution with the right concentration, you're not alone. Mixing chemicals takes care and precision. That’s why we created the Tocris Molarity Calculator to make your lab work simpler and faster.

Our calculator helps you figure out how much of a compound you need to add to get your desired molarity. No confusing steps, no guesswork.

What Is Molarity and Why It Matters

Molarity shows how many moles of a substance are in one liter of solution. It’s key in chemistry because it tells you the exact concentration of your solution.

For example, if you want a 1 molar (1 M) salt solution, you need to dissolve one mole of salt in one liter of water.

The Simple Formula Behind the Calculator

To find the mass you need, use this formula:

Mass (grams) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

Let’s break it down:

• Concentration: The molarity you want (in moles per liter).
• Volume: How much solution you want to prepare (in liters).
• Molecular Weight: The weight of one mole of your compound (in grams).

How to Use the Tocris Molarity Calculator

Using our calculator is a breeze:

1. Enter the concentration you want. Choose the unit (molar, millimolar, etc.).
2. Type the volume you plan to make and pick its unit (liters, milliliters).
3. Input the molecular weight of your chemical (check your bottle label).
4. Hit calculate, and you’ll get the exact mass to weigh out.

The calculator will also show the mass in grams, milligrams, and smaller units if needed.

Converting Between Units Made Simple

Chemistry involves many units. Sometimes you need to convert weight percent (wt%) to molarity or mg/mL to molarity.

For example, to convert mg/mL to molarity:

1. Convert mg/mL to grams per liter (multiply by 1,000).
2. Divide by molecular weight (g/mol) to get molarity.

This way, you’ll know exactly how concentrated your solution is.

What About Dilutions?

If you want to dilute a stock solution to a lower concentration, use the dilution formula:

C1 × V1 = C2 × V2

Where:

• C1 = concentration of stock solution
• V1 = volume of stock needed
• C2 = desired concentration
• V2 = final volume after dilution

Our calculator can help you with these steps as well.

Real-World Example: Calculating Molarity of EDTA Solution

Say you want to make 100 mL of 0.1 M EDTA solution. The molecular weight of EDTA is about 292.24 g/mol.

Using the formula:

Mass = 0.1 mol/L × 0.1 L × 292.24 g/mol = 2.9224 g

You need to weigh out 2.92 grams of EDTA and dissolve it in 100 mL water.

Final Verdict

The Tocris Molarity Calculator takes the math off your shoulders. It makes chemistry faster and less stressful. Whether you’re a student or a pro in the lab, this tool helps you get right to work.

FAQs

What units can I use in the calculator?

You can input concentration in molar (M), millimolar (mM), micromolar (μM), and more. Volume units include liters (L), milliliters (mL), and microliters (μL).

How do I find molecular weight?

It’s usually on the chemical’s label or datasheet. If not, check trusted chemical databases.

Can this calculator help with dilutions?

Yes! Use it with the dilution formula to find the volume or concentration needed.

How do I convert weight percent (wt%) to molarity?

Multiply wt% by 10, then divide by the molecular weight to get molarity.