4. in about 50 mL of water. The mass of the final solution is 51.98 g. Determine

Question

4. in about 50 mL of water. The mass of the final solution is 51.98 g. Determine the mass percent NaCl in the solution. A student prepared a solution of sodium chloride (NaCI) in distilled water by dissolving 1.05 g of NaCl 5. A student uses a volumetric pipet to transfer 10.00 mL of the NaCI solution as described question 3 to a beaker. The mass of this volume of solution is 10.08 g. Determine the density of the solution. 6. The student prepared two more NaCI solutions in water. The densities of these solutions, as well as distilled water is determined. The results are summarized in the table below. Record your calculated results from question 4 &5 in this table solution water 0 0.993 mass percent NaCl, % 4.07 6.16 density, g/mL 1.021 1.034 Prepare a graph of density versus mass percent NaCI for these solutions, either using a computer spreadsheet program or draw by hand. Determine the trend line equation by either drawing the best straight line through data points and calculating slope and y-intercept values or by using a computer spreadsheet program to determine the equation of the trend line. Attach your graph and record the equation of the trend line below (be sure to define x and y in terms of the variables graphed); 7. The student obtains an unknown NaCI solution and determines that its density is 1,015 g/ml. Determine the mass percent NaCl using the trend line from question 6

Explanation / Answer

4)

Mass of NaCl = 1.05 g

Mass of final solution = 51.98 g

Mass percent of NaCl in solution = (Mass of NaCl/Mass of final solution) x 100

= (1.05/51.98) x 100

= 2.02%

(5)

Volume of the solution = 10.0 mL

Mass of solution = 10.08 g

Density = Mass of solution / Volume of the solution

= 10.08 g/ 10.0 mL

= 1.008 g/mL

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