|
 |  Physical Science, 5/e Bill Tillery,
Arizona State University
Water and Solutions
Exercises- A 50.0 g sample of a saline solution contains 1.75 g NaCl. What is the percentage by weight concentration?Answer
- A student attempts to prepare a 3.50 percent by weight saline solution by dissolving 3.50 g NaCl in 100 g of water. Since equation 13.2 calls for 100 g of solution, the correct amount of solvent should have been 96.5 g water (100 - 3.5 = 96.5). What percent by weight solution did the student actually prepare?Answer
- Seawater contains 30,113 ppm by weight dissolved sodium and chlorine ions. What is the percent by weight concentration of sodium chloride in seawater?Answer
- What is the mass of hydrogen peroxide, H2O2, in 250 grams of a 3.0% by weight solution?Answer
- How many mL of pure alcohol are in a 200 mL glass of wine that is 12 percent alcohol by volume?Answer
- How many mL of pure alcohol are in a single cocktail made with 50 mL of 40% vodka? (Note: "Proof" is twice the percent, so 80 proof is 40%.) Answer
- If fish in a certain lake are reported to contain 5 ppm by weight DDT, (a) what percentage of the fish meat is DDT?Answer (b) How much of this fish would have to be consumed to reach a poisoning accumulation of 17.0 grams of DDT?Answer
- For each of the following reactants, draw a circle around the proton donor and a box around the proton acceptor. Label which acts as an acid and which acts as a base.
(a) HC2H3O2(aq) + H2O(l)⇔ H3O+(aq) + C2H3O22(aq)
(b) C6H6NH2(l) + H2O(l)⇔ C6H6NH3+(aq) + OH2(aq)
(c) HClO4(aq) + HC2H3O2(aq)⇔ H2C2H3O2+(aq) + ClO42(aq)
(d) H2O(l) + H2O(l)⇔ H3O+(aq) + OH2(aq)Answer
|
|
|
2002 McGraw-Hill Higher Education