A solution of NaOH(molar mass 40g mol-1)is prepared by dissolving 1.6g of NaOH in 500 cm cube of water.Calculate molarity(M) of the solution
To calculate the molarity (M) of a solution, you need to know the moles of solute (NaOH) dissolved and the volume of the solution.
Step 1: Calculate the number of moles of NaOH:
To calculate the number of moles, use the formula:
moles = mass / molar mass
Given that the mass of NaOH is 1.6 g and the molar mass is 40 g mol^-1:
moles = 1.6 g / 40 g mol^-1 = 0.04 mol
Step 2: Convert the volume from cm³ to liters:
The volume of the solution is given as 500 cm³. To convert it to liters, divide by 1000:
volume = 500 cm³ / 1000 = 0.5 L
Step 3: Calculate the molarity:
The molarity (M) is defined as the number of moles of solute divided by the volume of the solution in liters.
Molarity (M) = moles / volume
Molarity (M) = 0.04 mol / 0.5 L = 0.08 M
Therefore, the molarity of the NaOH solution is 0.08 M.