Question

The table shows four solutions that were prepared by
dissolving salt in water.
Solution
Mass of NaCl Volume of Water
(g)
(mL)
A
5.0
50.0
B
5.0
75.0
С
5.0
100.0
D
5.0
125.0
Which of the solutions has the highest salt
concentration?
O A. Solution B
OB. Solution D
O C. Solution C
O D. Solution A

Answer 1

Answer:

a

Explanation:

Answer 2

The solution that has the highest concentration given the data is solution A ( Option D)

What is molarity?

This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

How to determine the mole of NaCl

• Mass of solute = 5 g
• Molar mass of NaCl = 58.5 g/mol
• Mole of NaCl =?

Mole = mass / molar mass

Mole of NaCl = 5 / 58.5

Mole of NaCl = 0.085 mole

How to determine the molarity of solution A

• Mole of NaCl = 0.085 mole  
• Volume = 50 mL = 50 / 1000 = 0.05 L
• Molarity of solution A =?

Molarity = mole / Volume

Molarity of solution A = 0.085 / 0.05

Molarity of solution A = 1.7 M

How to determine the molarity of solution B

• Mole of NaCl = 0.085 mole  
• Volume = 75 mL = 75 / 1000 = 0.075 L

• Molarity of solution B =?

Molarity = mole / Volume

Molarity of solution B = 0.085 / 0.075

Molarity of solution B = 1.13 M

How to determine the molarity of solution C

• Mole of NaCl = 0.085 mole  
• Volume = 100 mL = 100 / 1000 = 0.1 L
• Molarity of solution C =?

Molarity = mole / Volume

Molarity of solution C = 0.085 / 0.1

Molarity of solution C = 0.85 M

How to determine the molarity of solution D

• Mole of NaCl = 0.085 mole  
• Volume = 125 mL = 125 / 1000 = 0.125 L
• Molarity of solution D =?

Molarity = mole / Volume

Molarity of solution D = 0.085 / 0.125

Molarity of solution D = 0.68 M

SUMMARY

• Molarity of solution A = 1.7 M
• Molarity of solution B = 1.13 M
• Molarity of solution C = 0.85 M
• Molarity of solution D = 0.68 M

Thus, solution A has the highest concentration of the salt.

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