Gram Equivalent Weight Calculator

Gram Equivalent Weight Formula:

\[ EW = \frac{Molar\ Mass}{n} \]

Gram Equivalent Weight (EW):

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1. What is Gram Equivalent Weight?

Gram equivalent weight (EW) is the mass of a substance that will combine with or displace 1 mole of hydrogen ions (H⁺) in an acid-base reaction or 1 mole of electrons in a redox reaction. It represents the reactive capacity of a substance in chemical reactions.

2. How Does the Calculator Work?

The calculator uses the equivalent weight formula:

\[ EW = \frac{Molar\ Mass}{n} \]

Where:

\( EW \) — Gram equivalent weight (g/eq)
\( Molar\ Mass \) — Molecular weight of the substance (g/mol)
\( n \) — Number of equivalents per mole (unitless)

Explanation: The equivalent weight depends on the specific chemical reaction and represents the mass of substance that provides one equivalent of reactive species.

3. Importance of Equivalent Weight Calculation

Details: Equivalent weight is crucial in stoichiometric calculations for acid-base titrations, redox reactions, and precipitation reactions. It helps determine the exact amounts of reactants needed for complete reaction.

4. Using the Calculator

Tips: Enter the molar mass in g/mol and the number of equivalents per mole. Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine the value of n for different compounds?
A: For acids, n equals the number of H⁺ ions; for bases, it's the number of OH⁻ ions; for redox reactions, it's the number of electrons transferred.

Q2: Does equivalent weight change for the same compound?
A: Yes, equivalent weight depends on the specific reaction. The same compound can have different equivalent weights in different reactions.

Q3: What's the difference between molecular weight and equivalent weight?
A: Molecular weight is fixed for a compound, while equivalent weight varies depending on the reaction context.

Q4: How is equivalent weight used in titrations?
A: In titration calculations, equivalent weight helps determine the concentration of unknown solutions using the concept of equivalents.

Q5: Can equivalent weight be used for elements?
A: Yes, for elements, equivalent weight is the atomic weight divided by the valence in a particular compound.