3.4.1 Calculating concentrations from mass and volume

• What is the symbol for millilitres?

  mL
• What is the symbol for decimetres?

  dm³
• What are common units for mass and volume?

  • Mass Units:
  • Grams (g)
  • Kilograms (kg)
  • Volume Units:
  • Millilitres (mL)
  • Cubic centimetres (cm³)
  • Decimetres (dm³)
  • Litres (L)
• What is the symbol for cubic centimetres?

  cm³
• What is needed to convert mass to moles?

  Molar mass of the substance
• What is molar mass?

  Mass of one mole of a substance
• If 1 mole of salt is dissolved in 1 dm³ of water, what is the concentration?


  1 mol/dm³
• Why is knowing mass and volume units important in concentration calculations?

  It ensures accurate calculations
• What is the symbol for kilograms?

  kg
• What is the symbol for grams?


  g
• What does mol/dm³ represent in concentration?

  Moles of solute per cubic decimeter of solution
• What is the definition of concentration in chemistry?

  • Concentration indicates how much solute is dissolved.
  • Measured in moles per volume of solution.
  • Commonly expressed in mol/dm³.
• What is the concentration formula used in calculations?

  $C =$$\frac{n}{V}$
• What is the first step in calculating concentration?

  Identify moles and volume
• How many grams are in 1 kilogram?

  1000 g
• If you need 500 mL of solution, how many dm³ do you need?

  0.5 dm³
• How many millilitres are in 1 decimetre cubed?

  1000 mL
• How is molar mass usually expressed?

  Grams per mole (g/mol)
• Why is it important to convert mL to dm³?

  To standardize measurements in litres
• What is the symbol for litres?

  L
• What is the converted volume of 500 mL in dm³?

  0.5 dm³
• What is the relationship between 1 dm³ and 1 L?

  1 dm³ = 1 L
• What are the steps to calculate concentration?

  1. Identify moles (n) and volume (V)
  2. Use the concentration formula: \( C = \frac{n}{V} \)
  3. Perform the calculation by dividing moles by volume
• If you have 2 kg of sugar, how many grams do you have?

  2000 g
• What are the components of the concentration formula?

  • Concentration (C): mol/dm³
  • Moles of solute (n): mol
  • Volume of solution (V): dm³
• What does 'V' represent in the concentration formula?

  The volume of the solution in dm³
• What is the converted volume of 150 mL in dm³?

  0.15 dm³
• How do you calculate concentration using moles and volume?

  Divide moles by volume
• What does 'n' represent in the concentration calculation?

  The number of moles of the solute
• If you have 2 moles of sugar in 0.5 dm³ of water, what is the concentration?

  4 mol/dm³
• Why is it important to convert units before using them in concentration formulas?

  To ensure consistency and accuracy in calculations
• If you have 2 moles of NaCl in 0.5 dm³ of water, what is the concentration?

  4 mol/dm³
• What does concentration measure in a solution?

  Amount of solute in a given volume
• How do you calculate the concentration of sodium chloride solution?

  Divide moles of NaCl by volume of water
• What is the formula to convert mass to moles?

  $\text{Moles} =$$\frac{\text{Mass}}{\text{Molar Mass}}$
• Where can you find the molar mass of a substance?

  On the periodic table
• What is the molar mass of NaCl?

  58.44 g/mol
• What is 1 dm³ equivalent to in litres?

  1 litre (L)
• How do you convert millilitres (mL) to dm³?

  Divide the volume in mL by 1000
• What are the steps to convert mass to moles?

  1. Find the molar mass from the periodic table
  2. Divide mass by molar mass using the formula:

  • \( \text{Moles} = \frac{\text{Mass}}{\text{Molar Mass}} \)