Question

4.0g of sodium hydroxide in 250cm3 of solution contains?

Answer 1

To determine the concentration of sodium hydroxide in the solution, we need to calculate the molarity using the formula:

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

First, calculate the moles of sodium hydroxide using its molar mass:
Molar mass of NaOH = 23g/mol (for Na) + 16g/mol (for O) + 1g/mol (for H) = 40g/mol
moles of NaOH = 4g / 40g/mol = 0.1 moles

Convert the volume of the solution from cm3 to liters:
250 cm3 = 0.25 liters

Now, plug the values into the formula to calculate the molarity:
Molarity (M) = 0.1 moles / 0.25 liters = 0.4 M

Therefore, the solution contains 0.4 moles of sodium hydroxide per liter.