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Seatwork 1

1. This document provides 17 chemistry problems involving calculating concentrations of solutions using molarity, molality, percent by mass, parts per million, normality, and other units. 2. The problems cover a range of concentration calculations including determining the molality of a CaCl2 solution, the mass of glucose needed for a given molar solution, the mass and concentration of acetic acid in a vinegar bottle, and calculating volumes and amounts of reactants needed to achieve given concentrations. 3. The document instructs the student to show their work and solutions on a single sheet of paper to submit for grading.

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Drusilla Loss
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471 views1 page

Seatwork 1

1. This document provides 17 chemistry problems involving calculating concentrations of solutions using molarity, molality, percent by mass, parts per million, normality, and other units. 2. The problems cover a range of concentration calculations including determining the molality of a CaCl2 solution, the mass of glucose needed for a given molar solution, the mass and concentration of acetic acid in a vinegar bottle, and calculating volumes and amounts of reactants needed to achieve given concentrations. 3. The document instructs the student to show their work and solutions on a single sheet of paper to submit for grading.

Uploaded by

Drusilla Loss
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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Problem Solving. Assignment PART 2. CONCENTRATIONS OF SOLUTIONS.

Instructions: Write your solution and answer in a 1 whole sheet of yellow paper only to be submitted on the time of
our scheduled make-up class or our lecture time.

1. What is the molality of a solution prepared by dissolving 32.0 g of CaCl2 in 271 g of water?
2. How many grams of glucose (C6H12O6) must be dissolved in 563 g of ethanol (C2H5OH) to prepare a 2.40x10-2 m
solution?
3. The label on a bottle of vinegar says it contains 5.0% acetic acid,CH3COOH. The bottle contains 240 mL of
vinegar.How many grams of acetic acid are in the bottle?
4. How would you prepare 250 mL of a 4.4% w/v KBr solution in water? Assume that a 250-mL volumetric flask is
available.
5. If 6.0 g of NaCl is dissolved in enough water to make 300. mL of solution, what is the w/v percent of NaCl?
6. If 6.7 g of lithium iodide, LiI, is dissolved in enough water to make 400. mL of solution, what is the w/v percent of
LiI?
7. How do we prepare 2.0 L of a 0.15 M aqueous solution of sodium hydroxide, NaOH?
8. If we dissolve 18.0 g of Li2O molar mass 29.9 g/mol in sufficient water to make 500. mL of solution, what is the
molarity of the solution?
9. The concentration of sodium chloride in blood serum is approximately 0.14 M. What volume of blood serum
contains 2.0 g of NaCl?
10. Suppose we have a bottle of concentrated acetic acid (6.0 M). How would you prepare 200 mL of a 3.5 M solution
of aceticacid?
11. Calculate the normality of a solution containing 2.45 g of sulfuric acid in 2.00 L of solution.
12. How many grams of hydrochloric acid are contained in 2.00 L of 0.500 N solution?
13. What is the concentration of a solution, in parts per million, if 0.02 gram of NaCl is dissolved in 1000 grams of
solution?
14. 35 grams of ethanol is dissolved in 115 grams of water. What is the concentration of ethanol in parts per billion
(ppb)?
15. How many milliliters of 5.5 M NaOH are needed to prepare 300 mL of 1.2 M NaOH?
16. Calculate the Normality of Calcium hydroxide solution containing 6.32g of calcium hydroxide in 5.82L solution.
17. Determine the equivalents needed to make 1.5L of 3N solution of HCl.
18. What is the molar concentration of K+ in a solution that contains 63.3ppm of K3Fe(CN)6?
19. A solution has a concentration of 1.25g per liter. What is the concentration in ppm?

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