250ml solutions is prepared on dissolving 20g NaOH. Calculate the molarity of solution

how many moles NaOH?

how many liters of solution?

M = moles/liter

To calculate the molarity of a solution, you need to use the formula:

Molarity (M) = moles of solute / volume of solution in liters

First, let's calculate the moles of NaOH.

The molar mass of NaOH is:
Na (Sodium) = 22.99 g/mol
O (Oxygen) = 16.00 g/mol
H (Hydrogen) = 1.01 g/mol

So, the molar mass of NaOH is:
22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 39.99 g/mol

Now, let's calculate the moles of NaOH:
moles = mass / molar mass = 20 g / 39.99 g/mol ≈ 0.500 mol

Now, let's calculate the volume of the solution in liters. We have 250 mL, but it needs to be converted to liters:
volume = 250 mL / 1000 mL/L = 0.250 L

Finally, let's calculate the molarity:
Molarity = moles / volume = 0.500 mol / 0.250 L = 2.000 M

Therefore, the molarity of the NaOH solution is 2.000 M.