25cm³ of a solution contains 1.06g of anhydrous Na²Co³ in 200cm³ solution requires and 20cm³ of an aqueous solution of H²So⁴.
a.what is the concentration of acid solution in mol/dm³? (Na=23,C=12,O=16)
b.calculate the mass conc
c.molar conc
of Na²Co³ in the solution
a. The concentration of the acid solution in mol/dm³ is 0.1 mol/dm³.
b. The mass concentration of the acid solution is 5.3 g/dm³.
c. The molar concentration of Na²Co³ in the solution is 0.04 mol/dm³.
To find the concentration of the acid solution, we need to know the number of moles of H2SO4 present in the 20 cm³ solution.
a. Calculate the concentration of the acid solution in mol/dm³:
Step 1: Find the number of moles of H2SO4 in the solution.
Molar mass of H2SO4 = (2 * 1) + 32 + (4 * 16) = 98 g/mol
Mass of H2SO4 = volume of solution * concentration of H2SO4 (in g/cm³)
Given volume = 20 cm³
Concentration of H2SO4 = mass of H2SO4 / volume of solution = 1.06 g / 200 cm³ = 0.0053 g/cm³
Number of moles of H2SO4 = mass of H2SO4 / molar mass = 0.0053 g / 98 g/mol ≈ 0.0000541 mol
Step 2: Convert the volume of the solution to dm³.
1 cm³ = 0.001 dm³
Given volume = 20 cm³
Volume of the solution in dm³ = 20 cm³ * 0.001 dm³/ cm³ = 0.02 dm³
Step 3: Calculate the concentration of the acid solution in mol/dm³.
Concentration of H2SO4 = Number of moles / Volume of the solution in dm³
Concentration of H2SO4 = 0.0000541 mol / 0.02 dm³ ≈ 0.002705 mol/dm³
Therefore, the concentration of the acid solution is approximately 0.002705 mol/dm³.
b. To calculate the mass concentration, we need to know the mass of the solution.
Step 1: Convert the volume of the solution to dm³.
Given volume = 20 cm³
Volume of the solution in dm³ = 20 cm³ * 0.001 dm³/cm³ = 0.02 dm³
Step 2: Calculate the mass concentration.
Mass concentration = mass of H2SO4 / volume of the solution in dm³
Mass concentration = 1.06 g / 0.02 dm³ = 53 g/dm³
Therefore, the mass concentration of the solution is 53 g/dm³.
c. The molar concentration is the same as the concentration of the acid solution calculated in part a. Therefore, the molar concentration is approximately 0.002705 mol/dm³.