What is the density of concentrated phosphoric acid?

What is the composition of concentrated phosphoric acid and how is its density calculated? The density of concentrated phosphoric acid is calculated based on its composition, which is 85% phosphoric acid and 15% water by mass. To determine the density of concentrated phosphoric acid, we need to consider the density of each component and their respective masses in the solution.

Density Calculation:

Given: 85% phosphoric acid and 15% water

Formula: Density = Mass/Volume

To calculate the volume of water in the solution, we use the given data that the mass of water is 15g and the density of water is 1g/mL. By substituting these values into the formula, we find that the volume of water in the solution is 15mL. Next, we calculate the volume of phosphoric acid in the solution by subtracting the volume of water from the total volume of the solution. The volume of phosphoric acid is found to be 42.82mL. Finally, we calculate the density of phosphoric acid by dividing the mass of phosphoric acid (85g) by the volume of phosphoric acid (42.82mL). This calculation yields a density of 1.98g/mL for phosphoric acid. Therefore, the density of concentrated phosphoric acid with 85% concentration and 15M molarity is approximately 1.98g/mL.

Understanding the Density Calculation Process:

Composition of Concentrated Phosphoric Acid: The composition of concentrated phosphoric acid is provided as 85% phosphoric acid and 15% water by mass. This composition indicates the distribution of the components within the solution.

Calculating Volume of Water:

Volume of Water Calculation: The mass of water in the solution is given as 15g, and the density of water is 1g/mL. By applying the formula for density, we determine that the volume of water present in the solution is 15mL.

Calculating Volume of Phosphoric Acid:

Volume of Phosphoric Acid Calculation: The volume of phosphoric acid in the solution is obtained by subtracting the volume of water from the total volume of the solution. This calculation results in a volume of 42.82mL for phosphoric acid.

Calculating Density of Phosphoric Acid:

Density Calculation: The final step involves calculating the density of phosphoric acid by dividing the mass of phosphoric acid by its volume. This calculation reveals a density of 1.98g/mL for phosphoric acid in the concentrated solution.

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