Molar Concentration: Write the complete solution:
1. Sea water contains an average of 1.08 x ppm of Na+ and 270 ppm of SO4-². Calculate the molar concentrations of Na+ and SO4-² given that the average density of sea water is 1.02g/ml
To calculate the molar concentrations of Na+ and SO4-² in sea water, we first need to convert the ppm values to molarity.
1. Convert ppm to g/L for Na+:
1.08 x ppm = 1.08g/L
2. Convert ppm to g/L for SO4-²:
270 ppm = 270g/L
3. Calculate the molar mass of Na+ and SO4-²:
Na+ molar mass = 22.99 g/mol
SO4-² molar mass = 96.06 g/mol
4. Calculate the molar concentrations of Na+ and SO4-² using the formula:
Molarity = (mass / molar mass) / volume
For Na+:
Molarity of Na+ = (1.08g/L / 22.99 g/mol) / 1.02g/mL = 0.0467 mol/L
For SO4-²:
Molarity of SO4-² = (270g/L / 96.06 g/mol) / 1.02g/mL = 2.687 mol/L
Therefore, the molar concentration of Na+ in sea water is 0.0467 mol/L and the molar concentration of SO4-² in sea water is 2.687 mol/L.