Question

Calculate the molarity of a solution containing 0.2 mol of sodium hydroxide dissolved in 0.5 L of water. Be sure to report your answer in proper significant figures and use the appropriate symbol.

Answer 1

Answer:

The molarity is 0.4 $\frac{moles}{liter}$

Explanation:

The Molarity (M) or Molar Concentration is a concentration unit that indicates the number of moles of the solute per liter of solution. In other words, molarity is defined as the number of moles of solute that are dissolved in a given volume.

The Molarity of a solution is determined by the expression:

$Molarity (M)=\frac{number of moles of solute}{volume}$

Molarity is expressed in units ($\frac{moles}{liter}$).

In this case:

• number of moles of solute (sodium hydroxide)= 0.2 moles
• volume= 0.5 L

Replacing:

$Molarity (M)=\frac{0.2 moles}{0.5 L}$

Molarity= 0.4 $\frac{moles}{liter}$

The molarity is 0.4 $\frac{moles}{liter}$