If 10 grams of NaOH is dissolved in enough water to make 500 mL of solution, wha

Practice Questions

Q1
If 10 grams of NaOH is dissolved in enough water to make 500 mL of solution, what is the molarity of the solution? (Molar mass of NaOH = 40 g/mol)
  1. 0.5 M
  2. 1 M
  3. 2 M
  4. 0.25 M

Questions & Step-by-Step Solutions

If 10 grams of NaOH is dissolved in enough water to make 500 mL of solution, what is the molarity of the solution? (Molar mass of NaOH = 40 g/mol)
  • Step 1: Identify the mass of NaOH you have, which is 10 grams.
  • Step 2: Find the molar mass of NaOH, which is given as 40 g/mol.
  • Step 3: Calculate the number of moles of NaOH using the formula: Moles = Mass (g) / Molar Mass (g/mol). So, Moles of NaOH = 10 g / 40 g/mol.
  • Step 4: Perform the calculation: 10 g / 40 g/mol = 0.25 moles of NaOH.
  • Step 5: Convert the volume of the solution from mL to L. Since 500 mL = 0.5 L.
  • Step 6: Calculate the molarity (M) using the formula: Molarity = Moles of solute / Volume of solution (L). So, Molarity = 0.25 moles / 0.5 L.
  • Step 7: Perform the calculation: 0.25 moles / 0.5 L = 0.5 M.
  • Molarity Calculation – Molarity is calculated by dividing the number of moles of solute by the volume of solution in liters.
  • Moles and Molar Mass – Understanding how to convert grams of a substance to moles using its molar mass.
  • Volume Conversion – Converting milliliters to liters for proper molarity calculation.
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