* Percentage Purity: This tells you the proportion of a pure substance in a sample. For example, 95% pure NaCl means that 95% of the sample is actual sodium chloride, while the remaining 5% could be impurities.
* Concentration: This describes the amount of a solute dissolved in a solvent. Common units include molarity (mol/L), molality (mol/kg), and parts per million (ppm).
To convert percentage purity to concentration, you need additional information:
1. The density of the solution: This is necessary to relate the mass of the pure substance to the volume of the solution.
2. The molecular weight of the pure substance: This is required to calculate the molarity of the solution.
Here's how you can make the conversion:
1. Calculate the mass of the pure substance:
* Let's say you have 100 g of a solution with 95% purity.
* The mass of the pure substance is 100 g * 0.95 = 95 g
2. Calculate the volume of the solution:
* Use the density of the solution. Let's assume the density is 1.2 g/mL.
* Volume = Mass / Density = 100 g / 1.2 g/mL = 83.3 mL = 0.0833 L
3. Calculate the molarity:
* Let's assume the molecular weight of the pure substance is 58.44 g/mol (for NaCl).
* Moles of pure substance = Mass / Molecular weight = 95 g / 58.44 g/mol = 1.62 mol
* Molarity = Moles / Volume = 1.62 mol / 0.0833 L = 19.4 mol/L
Therefore, a 95% pure NaCl solution with a density of 1.2 g/mL would have a concentration of approximately 19.4 mol/L.
Important Note: Make sure to use the correct units and be careful with the information you have available. If you're unsure, it's always best to consult a chemistry textbook or an expert.
