Which is more concentrated, a solution (1) prepared by dissolving 21.0 g of naf (0.500 mol) in enough water to make 500 ml of solution or a solution (2) prepared by dissolving 10.5 g (0.250 mol) of naf in enough water to make 100 ml of solution?

Question

Chemistry

Mariam Lin

16 April, 16:55

Which is more concentrated, a solution (1) prepared by dissolving 21.0 g of naf (0.500 mol) in enough water to make 500 ml of solution or a solution (2) prepared by dissolving 10.5 g (0.250 mol) of naf in enough water to make 100 ml of solution?

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Answers (1)

Know the Answer?

David Boyd · Answer 1

A solution (2) prepared by dissolving 10.5 g (0.250 mol) of naf in enough water to make 100 ml of solution is more concentrated.

Explanation:

Calculate the molarity of Solution 1

M = (moles) * 1000 / V (ml)

M = (0.500) * 1000/500 = 1 M

Calculate the molarity of Solution 2

M = (moles) * 1000 / V (ml)

M = (0.250) * 1000/100 = 2.5 M

Result:

As the molarity of Solution two is greater than solution 1. so Solution 2 is more concentrated