Solution Found!
A 205-mL sample of ocean water contains 6.8 g of NaCl.
Chapter 13, Problem 63P(choose chapter or problem)
A 205-mL sample of ocean water contains 6.8 g of NaCl. What is the molarity of the solution with respect to NaCl?
Questions & Answers
QUESTION:
A 205-mL sample of ocean water contains 6.8 g of NaCl. What is the molarity of the solution with respect to NaCl?
ANSWER:Solution 63P :
Step 1:
Given :
Amount of solute - NaCl = 6.8 g
Amount of solvent -ocean water = 205-mL
Molarity of the solution with respect to NaCl = ?
Molarity(M) is a unit of concentration measuring the number of moles of a solute per liter of solution. The SI unit of molarity is mol/L.
Formula to find the molarity of solution :
Molarity =
Amount of solvent is given in mL, let’s convert to L :
1 L = 1000 mL
Therefore, 205 mL in L will be :
= 0.205 L
We have the amount of solute in g, let’s calculate the number of moles first :
Number of moles (n) =
Molar mass of NaCl = 58.44 g/mol.
Therefore, n =
= 0.116 moles.