Indietro
Problema 48a
How many milliliters of a 0.45 M BaCl2 solution contain 15.0 g of BaCl2?
- How many milliliters of a 0.350 M KOH solution contain 0.0171 mol of KOH?
Problema 49
- The sterile saline solution used to rinse contact lenses can be made by dissolving 400 mg of NaCl in sterile water and diluting to 100 mL. What is the molarity of the solution?
Problema 50
Problema 50a
Write balanced net ionic equations for the following reactions in acidic solution. (a) Zn(s) + VO2+(aq) → Zn2+(aq) + V3+(aq)
- The concentration of glucose (C6H12O6) in normal blood is approximately 90 mg per 100 mL. What is the molarity of the glucose?
Problema 51
- Copper reacts with dilute nitric acid according to the following equation: If a copper penny weighing 3.045 g is dissolved in a small amount of nitric acid and the resultant solution is diluted to 50.0 mL with water, what is the molarity of the Cu(NO3)2?
Problema 52
Problema 53a
The estimated concentration of gold in the oceans is 1.0 * 10^-11 g/mL. (a) Express the concentration in mol/L.
Problema 54a
How many grams of solute would you use to prepare the following solutions? (a) 500.0 mL of 1.25 M NaOH
Problema 54b
How many grams of solute would you use to prepare the following solutions? (b) 1.50 L of 0.250 M glucose (C6H12O6)
- How would you prepare 500 mL of a 0.330 M solution of CaCl2 from solid CaCl2? Specify the glassware that should be used.
Problema 55
- How would you prepare 250 mL of a 0.100 M solution of fluoride ions from solid CaF2? Specify the glassware that should be used.
Problema 56
- Pennies minted after 1982 are mostly zinc (97.5%) with a copper cover. If a post-1982 penny is dissolved in a small amount of nitric acid, the copper coating reacts as in Problem 4.52, and the exposed zinc reacts according to the following equation: For a penny that weighs 2.482 g, what is the molarity of the Zn(NO3)2 if the resultant solution is diluted to 250.0 mL with water?
Problema 57
- A bottle of 12.0 M hydrochloric acid has only 35.7 mL left in it. What will the HCl concentration be if the solution is diluted to 250.0 mL?
Problema 58
- What is the volume of the solution that would result by diluting 70.00 mL of 0.0913 M NaOH to a concentration of 0.0150 M?
Problema 59
- How would you prepare 250 mL of a 0.100 M solution of chloride ions from a 3.00 M stock solution of CaCl2? Spec-ify the glassware that should be used.
Problema 60
- How would you prepare each of the following solutions? (a) A 0.150 M solution of glucose in water
Problema 60
- How would you prepare 250 mL of 0.150 M solution of CaCl2 from a 3.00 M stock solution? Specify the glassware that should be used.
Problema 61
- The following aqueous solutions were tested with a light bulb conductivity apparatus, as shown in Figure 4.3. What result—dark, dim, or bright—do you expect from each? (a) 0.10 M potassium chloride (b) 0.10 M methanol (c) 0.10 M acetic acid
Problema 62
- The following aqueous solutions were tested with a light bulb conductivity apparatus, as shown in Figure 4.3. What result—dark, dim, or bright—do you expect from each? (a) 0.10 M hydrofluoric acid (b) 0.10 M sodium chloride (c) 0.10 M glucose (C6H12O6)
Problema 63
- A galvanic cell is constructed from a Zn/Zn2+ half-cell (anode) and a Cl2/Cl- half-cell (cathode). (b) Write balanced equations for the electrode and overall cell reactions.
Problema 63
- How would you prepare 250 mL of a 0.325 M solution of benzoic acid 1C7H6O22 in chloroform 1CHCl32?
Problema 63
- Individual solutions of Ba(OH)2 and H2SO4 both conduct electricity, but the conductivity disappears when equal molar amounts of the solutions are mixed. Explain.
Problema 64
- A solution of HCl in water conducts electricity, but a solu-tion of HCl in chloroform, CHCl3, does not. What does this observation tell you about how HCl exists in water and how it exists in chloroform?
Problema 65
- Classify each of the following substances as a strong electrolyte, weak electrolyte, or nonelectrolyte. (a) HBr (b) HF (c) NaClO4 (d) (NH4)2CO3 (e) NH3 (f) Ethyl alcohol
Problema 66
- Is it possible for a molecular substance to be a strong electrolyte? Explain.
Problema 67
Problema 68a
What is the total molar concentration of ions in each of the following solutions, assuming complete dissociation? (a) A 0.750 M solution of K2CO3
Problema 68b
What is the total molar concentration of ions in each of the following solutions, assuming complete dissociation? (b) A 0.355 M solution of AlCl3
Problema 69a
What is the total molar concentration of ions in each of the following solutions? (a) A 1.250 M solution of CH3OH
Problema 69b
What is the total molar concentration of ions in each of the following solutions? (b) A 0.225 M solution of HClO4
- Ringer's solution, used in the treatment of burns and wounds, is prepared by dissolving 4.30 g of NaCl, 0.150 g of KCl, and 0.165 g of CaCl2 in water and diluting to a volume of 500.0 mL. What is the molarity of each of the component ions in the solution?
Problema 70