Question

we dissolve 2.33g of sodium chloride NaCl in water to obtain 100ml of solution.
a) calculate the mass concentration of the solution.
b) deduce it's molar concentration Na: 23 - Cl: 36.

Answer 1

Answer on Question #53041 – Chemistry – General chemistry

Question

We dissolve 2.33g of sodium chloride NaCl in water to obtain 100ml of solution.

a) calculate the mass concentration of the solution.

b) deduce it's molar concentration Na: 23 - Cl: 36.

Answer:

a) $C_{\mathrm{m}}(\mathrm{NaCl}) = \mathrm{m} / \mathrm{V} = 2.33(\mathrm{g}) \cdot 0.1(\mathrm{L}) = 23.30\ \mathrm{g} / \mathrm{L}$

b) $C_{\mathrm{n}}(\mathrm{NaCl}) = \mathrm{n} / \mathrm{V} = \mathrm{m} / \mathrm{MV} = 2.33(\mathrm{g}) / 59(\mathrm{g} / \mathrm{mol}) \cdot 0.05(\mathrm{L}) = 0.39\ \mathrm{mol} / \mathrm{L}$

http://www.AssignmentExpert.com/