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Concept explainers
Finding the density of a solid.
The student then emptied the flask and dried it once again. To the empty flask she added pieces of a metal until the flask was about three-fourths full. She weighed the stoppered flask and its metal contents and found that the mass was
a. To find the density of the metal we need to know its mass and volume. We can easily obtain its mass by the method of differences:
b. To determine the volume of metal, we note that the volume of the flask must equal the volume of the metal plus the volume of water in the filled flask containing both metal and water. If we can find the volume of water, we can obtain the volume of metal by the method of differences. To obtain the volume of the water we first calculate its mass:
The volume of water is found from its density, as in lb. Note that
c. From the volume of the water, we calculate the volume of metal:
From the mass and volume of metal, we find the density, using the equation in 1b. Make the calculation.
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Chapter 1 Solutions
Chemical Principles in the Laboratory
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- A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: • The label on the graduated cylinder says: empty weight: 8.200 g • She put some solid sodium hydroxide into the graduated cylinder and weighed it. With the sodium hydroxide added, the cylinder weighed 45.74 g- • She added water to the graduated cylinder and dissolved the sodium hydroxide completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 24.09 ml. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. mlarrow_forwardThe mass of acetic acid in a 2.00 mL sample of vinegar (density of the vinegar is 1.00 g/mL) is determined to be 0.233 g. What is the mass % of acetic acid in the vinegar?arrow_forwardyou combined 25 ml of milk with 30 ml of vinegar. After 10 minutes you observe the mixture again and the graduated cylinder now reads a total of 51.5 ml. How many ml have evaporated from the mixture?arrow_forward
- A student pipetted 10 mL of a sample solution into a 250 mL volumetric flask and diluted it to the mark with distilled water. The student then, pipetted 10 mL of this new solution into a 50.00 mL volumetric flask and diluted it to the mark with water. What is the dilution factor of the final solution? 25X 100X 125X 5X 50Xarrow_forwardSuppose 25.4 grams of NaCl was added to 400 mL of water. The resulting solution was again diluted with water 1:100 with water. What is the final concentration of the NaCl in μM? The molecular weight of NaCl is 58.44.arrow_forwardA student places 14.8 mL of water in a graduated cylinder. The mass of the water and the graduated cylinder is found to be 41.721 grams, and then the balance is tared. After adding a number of metal pellets to the graduated cylinder, the liquid level in the cylinder is now 28.8 mL. The cylinder with the water and metal pellets is placed back on the balance, and the measured mass is 71.371 grams. Calculate the density of the metal pellets in g/mL. Do not include units in your answer.arrow_forward
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