Question

Write down the concentration of each of the following solutions in g/L and mol/L.  2) 2g NaOH in 50 mL solution

Answer 1

Given: Volume of solution = 50ml =0.05L, Mass of NaOH in gram =2g

Molecular Formula = NaOH

Molecular mass of NaOH = 23 +16 + 1 = 40m

Mass of HCL in Mole (mol)

= Mass of NaOH in gram(g)/ Molecular mass(m) = 2/40 =0.05 mol

Concentration of NaOH (g/L)

=Mass of solute (g)/Volume(L)  = 2g/0.05L = 40 g/L

Concentration of NaOH (mol/L)

=Mass of NaOH in moles/Volume of NaOH in L = 0.05mol/0.05L = 1 mol/L

Answer is 40 g/L & 1 mol/L