Question

Find the concentration in mol/dm^3 of the solution

0.8 g of solid sodium hydroxide is dissolved in
distilled water to a final volume of 1 dm³.

Answer 1

0.02 mol/dm³

Step-by-step explanation:

To find the concentration of the solution in mol/dm^3, you need to know the molar mass of sodium hydroxide and the number of moles of sodium hydroxide that are present in the solution.

The molar mass of sodium hydroxide is 40 g/mol. To find the number of moles of sodium hydroxide in the solution, divide the mass of sodium hydroxide (0.8 g) by the molar mass (40 g/mol):

0.8 g / 40 g/mol = 0.02 mol

The concentration of the solution is then calculated by dividing the number of moles of sodium hydroxide by the volume of the solution:

0.02 mol / 1 dm³ = 0.02 mol/dm³

So the concentration of the solution is 0.02 mol/dm³.