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Molarity quiz #4

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  • What is the concentration of lithium ions in 0.400 M Li2HPO4?
    Li2HPO4 gives 2 Li+ per formula unit. [Li+] = 0.400 M × 2 = 0.800 M.
  • An NaOH solution contains 1.90 mol of NaOH, and its concentration is 0.555 M. What is its volume?
    Volume = 1.90 mol / 0.555 M = 3.42 L.
  • How many moles of solute is added to a solution?
    The number of moles added is calculated by dividing the mass of solute by its molar mass.
  • The molarity (M) of a solution refers to what?
    It refers to the number of moles of solute per liter of solution.
  • How is molarity used as a conversion factor in chemical calculations?
    Molarity connects moles of solute and liters of solution, allowing you to convert between these units in calculations.
  • What does a solution labeled as 5.8 M NaCl indicate about its composition?
    It means there are 5.8 moles of NaCl dissolved in every 1 liter of the solution.
  • Why is it important to understand dimensional analysis when working with molarity problems?
    Dimensional analysis helps you use molarity as a conversion factor to solve for unknown quantities in solution calculations.
  • What is the difference between concentration and molarity as described in the lesson?
    Concentration is a general term for the amount of solute in solution, while molarity specifically measures moles of solute per liter of solution.
  • What symbol is commonly used to represent molarity in equations?
    Molarity is represented by a capital 'M' in equations.
  • How can you express the molarity of a solution as a fraction for use in calculations?
    You can write molarity as moles of solute divided by liters of solution, such as 5.8 moles/1 liter for a 5.8 M solution.
  • What does molarity measure in chemistry?
    Molarity measures the number of moles of solute per liter of solution, indicating the concentration of a solution.
  • What is the formula for calculating molarity?
    Molarity (M) is calculated using the formula: M = moles of solute / liters of solution.
  • What are the units used to express molarity?
    Molarity is expressed in moles per liter (mol/L).
  • What does the molarity of a solution indicate about its composition?
    The molarity of a solution indicates how many moles of solute are present in one liter of solution.
  • How is molarity used as a conversion factor in chemical calculations?
    Molarity can be used as a conversion factor to relate moles of solute to volume of solution, allowing conversion between these quantities in calculations.
  • What is the symbol commonly used to represent molarity?
    Molarity is commonly represented by a capital 'M'.
  • In chemistry, what does the term 'concentration' refer to when discussing solutions?
    Concentration refers to the amount of solute present in a given amount of solution, with molarity being a specific measure of concentration.
  • If a solution is described as 5.8 M sodium chloride, what does this mean?
    It means the solution contains 5.8 moles of sodium chloride (NaCl) in every one liter of solution.
  • Which unit is commonly used to express the concentration of a solution in terms of molarity?
    The unit commonly used is moles per liter (mol/L).
  • How can molarity help in determining unknown quantities in a chemical solution?
    By using the molarity formula and conversion factors, you can calculate unknown amounts of solute or solution volume in chemical problems.
  • What does it mean for a solution to be more concentrated in terms of molarity?
    A more concentrated solution has a higher molarity, meaning it contains more moles of solute per liter of solution.