High School

For each of the following solutions, calculate the:

a. Liters of a 2M KBr solution to obtain 3 moles of KBr.

b. Liters of a 1.5M NaCl solution to obtain 15 moles of NaCl.

c. Milliliters of a 0.8M Ca(NO₃)₂ solution to obtain 0.05 moles of Ca(NO₃)₂.

Answer :

Final answer:

In the 2M KBr solution, you would need 1.5 liters to obtain 3 moles of KBr; for the 1.5M NaCl solution, you would need 10 liters to obtain 15 moles of NaCl; and for the 0.8M Ca(NO3)2 solution, you would need 62.5 milliliters to get 0.05 moles of Ca(NO3)2.

Explanation:

The molarity equation is M = moles / liters. To obtain the required volume in liters, you simply rearrange the equation to liters = moles/M.

  1. For the 2M KBr solution: liters = 3 moles / 2 M = 1.5 liters of KBr solution.
  2. For the 1.5M NaCl solution: liters = 15 moles / 1.5 M = 10 liters of NaCl solution.
  3. For the 0.8 M Ca(NO3)₂ solution: liters = 0.05 moles / 0.8 M = 0.0625 liters. Since 1 liter contains 1000 milliliters, we can convert this value to 62.5 milliliters of Ca(NO3)₂ solution.

Learn more about Molarity Calculations here:

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