Question

Pre-Laboratory Assignment 2 Name: Section: Date: Beverage Density Lab 1. If the following mass and volume data are used to calculate the density of solution, how many significant figures are allowed in the calculated density? Mass of solution = 12.53 g; volume of solution - 8.27 ml 2. Calculate the density of the solution described in Question 1. 3. According to its nutrition label, orange soda contains 49 g of sugar per 355-mL serving. If the density of the bever- age is 1.043 g/mL, what is the percent sugar concentration in orange soda? Hint: This is a 2-step problem. First, use the density to convert the 355-mL serving size to grams. Then, calculate percent sugar in the beverage. 4. How well does the sweet taste of a beverage correlate with the amount of sugar it contains? Based on your mem- ory of taste, predict the relative sugar content of the following beverages that will be tested in this lab: cola, grape juice, and sports drink. 5. The following graph is a calibration curve for the density of an aqueous salt solution versus percent salt concentra tion. If the density of seawater is 1.025 g/mL, what is the percent salt concentration? Density (g/mL) 5 20 25 10 15 Percent Salt

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Answer 1

density = mass = 12.539 4 sf volume 8.27 mL sf. Thus, density cannot have more than 3 sf density will have 3 Sif. 2) (density = 1.52 g l ml 3) V=355mL &- liah3g/mL f=m m=1.043 x 355 ml ML m=370.2659 → 370.2659 soange sode contains 499 sugar . loog " 149 Xloog 370.265 13-239 4. sugar = 113.23% 4) cola > Grape > Sport-drink (more sweetness) least) 10254 s) of. Sult lone = (4.5%.] corresponding to density of 1.0259 4:51. ML