3. Table 2 lists the data a student determined for their unknown.

Table 2

Volume of liquid, mL	8.3 mL
Mass of cylinder and liquid, g	45.00 g
Mass of graduated cylinder, g	38.44 g
Solubility in water	i
Solubility in cyclohexane	s
Boiling Point C	80C

 

 

1. Calculate the density of the unknown liquid.

2. From Table 1 on pg 12, list the liquids whose densities and boiling points most closely match the unknown liquid. (Hint you should find 3)

1.

2.

3.

 

3. Compare the solubility data for the 3 possible match in part b) above with the solubility data the student recorded and see if you can identify which unknown from table 1 the student has. Write your answer in the space below.

      ______________

 

In studying an unknown liquid using the procedure of this experiment, a student recorded in Table 2 the following data. Based on your evaluation of all of the data in your answer to (2), including solubilities, identify the unknown liquid. Briefly explain your reasoning.

3. A student made multiple measurements to determine the density of an unknown liquid. a. The student weighed an empty graduated cylinder and then added her unknown to it. She read the volume of the liquid to be 3.50 ml. The mass of the empty cylinder was 352 gt The mass of the cylinder with the liquid was 39.456 g i. What is the mass of the liquid in the cylinder? ii. What is the density of the liquid? iii. How many significant figures should she have for: l. The mass of the liquid? Why? 2. The density of the liquid? Why? b. The student adds more of her unknown liquid to the cylinder. The new mass of the cylinder and liquid are 41.447 g. The new volume of the liquid is 5.77 mL. What is the density of her new sample? c. The theoretical density of her liquid is 0.857 g/mL. i. Determine the average density of her two samples. ii. Calculate the experimental error using the average of her two samples. d. The student plotted her data and found the y-intercept of the best fit line is 36.383 g and its slope to be 0.855 g/mL. Using the formula y mx b, write the equation for this line.

The density of an unknown liquid was determined in lab. The following data was col mass of empty graduated cylinder and liquid mass of empty graduated cylinder mass of liquid 2. 43.567 g 33.884 volume of liquid 8.85 mt Draw a 1o mnl gradusted emlnfir in the space on the right what is the density of the liquid? a.い3g-l.oqgimL Draw a meniscus at 8.85 ml of liquid. 8.85 mL What volume of a salt-water solution has a mass of 55.550 g? The density of this salt- water solution is 1.0807 g/mL = 55.50 volume salt water-514 4. How much water must be added to 15.00 g of alcohol to prepare a solution of alcohol and water that is 17.85% alcohol by mass? Draw and label a box that describes the solution. Show a unit conversion setup for full credit. water . Convert a. b. -95.0 Cto FT