Making the simplistic assumption that the dissolved NaCl(s) does not affect the

Question

Making the simplistic assumption that the dissolved NaCl(s) does not affect the volume of the solvent water, determine the constants m and b in the equation that relates the NaCl molarity to the NaCl(aq) density. Take the density of water to be 1.00 g/mL and the molar mass of NaCl to be 58.5 g/mol.

Concentration (M) Density (g/mL) 0 0.996 0.5 1.020 1 1.042 2 1.071 3 1.107 Density vs. Concentration y=0.036x + 1.0002 R2= 0.9929 1.120 1.100 1.080 1.060 1.040 O 1.020 1.000 0.980 0.5 1.5 2.5 3.5 Concentration (M)

Explanation / Answer

1/Molar Mass Na = m

m = 1 / 58.5g / mol = 0.01709 mol / g

Density H2O/Molar Mass Na = b

b = 1 g/mL/ 58.5g / mol = 0.01709 mol/mL

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