Answer: 1.15M
Step-by-step explanation:
Given that,
Amount of moles of NaOH (n) = ?
Mass of NaOH in grams = 23.0g
For molar mass of NaOH, use the atomic masses: Na = 23g; O = 16g; H = 1g
NaOH = (23g + 16g + 1g)
= 40g/mol
Since, n = mass in grams / molar mass
n = 23.0g / 40.0g/mol
n = 0.575 mole
Volume of NaOH solution (v) = 0.5 L
Concentration of NaOH solution (c) = ?
Since concentration (c) is obtained by dividing the amount of solute dissolved by the volume of solvent, hence
c = n / v
c = 0.575 mole / 0.5L
c = 1.15 M (M stands for molarity and gives the concentration in moles per litres)
Thus, the molarity of the solution is 1.15M