The molarity of the solution is 2.12 mol/L.
What is molarity ?
Molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution. In chemistry, the most commonly used unit for molarity is the number of moles per liter, having the unit symbol mol/L or mol/dm3 in SI unit. A solution with a concentration of 1 mol/L is said to be 1 molar, commonly designated as 1 M.
Molar mass Sodium Fluoride :
NaF = 22.98 + 18.99 => 41.97 g/mol number of moles ( n ) :
mass of solute / molar mass
2.25 / 41.97 => 0.053 moles
Volume = 25.0 mL in liters : 25.0 / 1000 => 0.025 L
M = n / V
M = 0.053 / 0.025
M = 2.12 mol/L
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