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Which of the following solutions will have the lowest freezing point?

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Question: Which of the following solutions will have the lowest freezing point?

Options:

  1. 0.1 M NaCl
  2. 0.1 M KBr
  3. 0.1 M MgCl2
  4. 0.1 M glucose

Correct Answer: 0.1 M MgCl2

Solution: 

MgCl2 dissociates into 3 ions, leading to the greatest freezing point depression among the options.

Which of the following solutions will have the lowest freezing point?

Practice Questions

Q1
Which of the following solutions will have the lowest freezing point?
  1. 0.1 M NaCl
  2. 0.1 M KBr
  3. 0.1 M MgCl2
  4. 0.1 M glucose

Questions & Step-by-Step Solutions

Which of the following solutions will have the lowest freezing point?
Correct Answer: MgCl2
  • Step 1: Understand that when a substance dissolves in water, it can break apart into smaller particles called ions.
  • Step 2: Identify the substances in the question and how many ions each one produces when dissolved.
  • Step 3: For example, MgCl2 breaks into 3 ions: 1 magnesium ion (Mg2+) and 2 chloride ions (Cl-).
  • Step 4: The more ions a substance produces, the more it can lower the freezing point of the solution.
  • Step 5: Compare the number of ions produced by each option to determine which has the most.
  • Step 6: Conclude that since MgCl2 produces the most ions, it will have the lowest freezing point.
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