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Millimolar Concentration Formula:
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Millimolar (mM) concentration represents the number of millimoles of a substance per liter of solution. It is a standard unit used in chemistry and biochemistry to express concentration in molar terms.
The calculator uses the conversion formula:
Where:
Explanation: This formula converts mass concentration (mg/mL) to molar concentration (mM) by accounting for the molecular weight of the substance and unit conversions.
Details: Converting between mass and molar concentrations is essential in laboratory work, pharmaceutical preparations, chemical reactions, and biological assays where molar quantities are required for stoichiometric calculations.
Tips: Enter the concentration in mg/mL and the molecular weight in g/mol. Both values must be positive numbers. The result will be displayed in millimolar (mM) units.
Q1: What is the difference between mg/mL and mM?
A: mg/mL is a mass concentration (weight per volume), while mM is a molar concentration (moles per volume). mM accounts for the molecular weight of the substance.
Q2: Why multiply by 1000 in the formula?
A: The factor 1000 converts mg to g (÷1000) and accounts for the conversion from mL to L (×1000), resulting in a net multiplication by 1000.
Q3: Can I use this calculator for any compound?
A: Yes, as long as you know the molecular weight of the compound. The calculator works for any pure substance with a known molecular weight.
Q4: What if I have concentration in other units?
A: Convert to mg/mL first. For example, μg/mL ÷ 1000 = mg/mL, or g/L × 1000 = mg/mL.
Q5: How accurate is this conversion?
A: The conversion is mathematically exact. Accuracy depends on the precision of your input values for concentration and molecular weight.