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A solution has a density of 1.2 g/mL and contains 10% (w/v) NaCl. What is the ma

Practice Questions

Q1
A solution has a density of 1.2 g/mL and contains 10% (w/v) NaCl. What is the mass of NaCl in 1 liter of this solution?
  1. 100 g
  2. 120 g
  3. 80 g
  4. 60 g

Questions & Step-by-Step Solutions

A solution has a density of 1.2 g/mL and contains 10% (w/v) NaCl. What is the mass of NaCl in 1 liter of this solution?
  • Step 1: Understand that '10% (w/v) NaCl' means there are 10 grams of NaCl in every 100 mL of solution.
  • Step 2: Since we want to find the mass of NaCl in 1 liter (1000 mL) of solution, we need to calculate how many grams are in 1000 mL.
  • Step 3: Use the formula: Mass of NaCl = (10 grams / 100 mL) x 1000 mL.
  • Step 4: Calculate: (10/100) x 1000 = 100 grams.
  • Step 5: Therefore, the mass of NaCl in 1 liter of this solution is 100 grams.
  • Density and Concentration Calculations – Understanding how to calculate mass from volume and concentration (w/v) in a solution.
  • Weight/Volume Percent (w/v) – Interpreting the meaning of a 10% (w/v) solution, which indicates grams of solute per 100 mL of solution.
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