1. What is Percent By Weight?

Percent by weight (%w/w) is a concentration term that represents the mass of solute per 100 units of mass of solution. It is commonly used in chemistry to express the concentration of solutions.

2. How Does the Calculator Work?

The calculator uses the percent by weight formula:

Where:

• Mass Solute — Mass of the dissolved substance (g)
• Mass Solution — Total mass of the solution (g)

Explanation: The formula calculates the percentage concentration by dividing the mass of solute by the total mass of solution and multiplying by 100.

3. Importance of Percent By Weight Calculation

Details: Percent by weight is crucial in various chemical applications including preparation of solutions, pharmaceutical formulations, and industrial processes where precise concentration measurements are required.

4. Using the Calculator

Tips: Enter the mass of solute and mass of solution in grams. Both values must be positive numbers, and the mass of solute cannot exceed the mass of solution.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between %w/w and %w/v?
A: %w/w is weight/weight percentage (mass per mass), while %w/v is weight/volume percentage (mass per volume).

Q2: When should I use percent by weight?
A: Use %w/w when working with solid-solid mixtures or when both solute and solvent are measured by mass.

Q3: Can percent by weight exceed 100%?
A: No, since the mass of solute cannot exceed the total mass of solution, %w/w values range from 0% to 100%.

Q4: How does temperature affect %w/w measurements?
A: Unlike volume-based measurements, %w/w is not affected by temperature changes since mass remains constant.

Q5: Is %w/w the same as ppm?
A: No, ppm (parts per million) is equivalent to 0.0001% w/w (1 ppm = 0.0001%).