Question

If salt (5. 99 × 10–6 mol) is dissolved in 1. 50 × 10–2 L of water, which expression can be used to find the molarity of the resulting solution? 2. 50 × 10-8 M 2. 50 × 103 M 3. 99 × 10–4 M 3. 99 × 104 M.

Answer 1

Molarity can be defined as the moles of solute in a liter of solution. The molarity of the salt solution is $\rm \bold{3.99\;\times\;10^{-4}\;M}$.

What is the relation between moles and volume?

The moles are the mass of substance with respect to the molar mass. The moles and volume relationship can be expressed in terms of molarity.

The molarity can be expressed as:

$\rm Molarity=\dfrac{Moles}{Volume}$

The given solution has,

• Moles of salt = $\rm 5. 99\;\times\; 10^-^6$

• The volume of solution = $\rm 1.50\;\times\;10^-^2$ L.

Substituting the values for molarity as:

$\rm Molarity=\dfrac{5.99\;\times\;10^{-6}}{1.50\;\times\;10^-^2\;L}\\ Molarity=3.99\;\times\;10^{-4}\;M$

The molarity of the solution is $\rm \bold{3.99\;\times\;10^{-4}\;M}$. Thus, option C  is correct.

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