You prepared an exact saturated solution of K₂Cr₂O7 at 70°C in 1 kg of water. You cool the water to 40°C. How much K₂Cr₂O7 7. stayed dissolved in the 1 kg of water? You prepared an exact saturated solution of K₂Cr₂O7 at 70°C in 1 kg of water. You cool the water to 40°C. How much K₂Cr₂O07 flocked out of solution as a solid? B How much K₂Cr₂O7 must be dissolved into 1 kg of water at 90°C to make an exact saturated solution? You prepared an exact saturated solution of K₂Cr₂O7 at 90°C in I kg of water. You cool the water to 50°C. How much K₂Cr₂O7 stayed dissolved in the 1 kg of water? You prepared an exact saturated solution of K₂Cr₂O7 at 90°C in 1 kg of water. You cool the water to 50°C. How much K₂Cr₂O7 flocked out of solution as a solid?

You prepared an exact saturated solution of K₂Cr₂O7 at 70°C in 1 kg of water. You cool the water to 40°C. How much K₂Cr₂O7 7. stayed dissolved in the 1 kg of water? You prepared an exact saturated solution of K₂Cr₂O7 at 70°C in 1 kg of water. You cool the water to 40°C. How much K₂Cr₂O07 flocked out of solution as a solid? B How much K₂Cr₂O7 must be dissolved into 1 kg of water at 90°C to make an exact saturated solution? You prepared an exact saturated solution of K₂Cr₂O7 at 90°C in I kg of water. You cool the water to 50°C. How much K₂Cr₂O7 stayed dissolved in the 1 kg of water? You prepared an exact saturated solution of K₂Cr₂O7 at 90°C in 1 kg of water. You cool the water to 50°C. How much K₂Cr₂O7 flocked out of solution as a solid?

Introductory Chemistry For Today

8th Edition

ISBN:9781285644561

Author:Seager

Publisher:Seager

Chapter7: Solutions And Colloids

Section: Chapter Questions

Problem 7.107E

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For each of the following pairs of solutions, select the solution for which solute solubility is greatest. a. Oxygen gas in water with P = 1 atm and T = 10C Oxygen gas in water with P = 1 atm and T = 20C b. Nitrogen gas in water with P = 2 atm and T = 50C Nitrogen gas in water with P = 1 atm and T = 70C c. Table salt in water with P = 1 atm and T = 40C Table salt in water with P = 1 atm and T = 70C d. Table sugar in water with P = 3 atm and T = 30C Table sugar in water with P = 1 atm and T = 80C
For each of the following pairs of solutions, select the solution for which solute solubility is greatest. a. Ammonia gas in water with P = 1 atm and T = 50C Ammonia gas in water with P = 1 atm and T = 90C b. Carbon dioxide gas in water with P = 2 atm and T = 50C Carbon dioxide gas in water with P = 1 atm and T = 50C c. Table salt in water with P = 1 atm and T = 60C Table salt in water with P = 1 atm and T = 50C d. Table sugar in water with P = 2 atm and T = 40C Table sugar in water with P = 1 atm and T = 70C
The freezing point of p-dichlorobenzene is 53.1 C, and its Kf is 7.10 C kg/mol. A solution of 1.52 g of the drug sulfanilamide in 10.0 g p-dichlorobenzene freezes at 46.7 C. Calculate the molar mass of sulfanilamide.
The dispersed phase of a certain colloidal dispersion consists of spheres of diameter 1.0 102 nm. (a) What are the volume (V=43r2) and surface area (A = r2) of each sphere? (b) How many spheres are required to give a total volume of 1.0 cm3? What is the total surface area of these spheres in square meters?
A compound has a solubility in water of 750 mg/L at 25C. Should this compound be characterized as a soluble or insoluble compound at 25C?
Table sugar (C12H22O11) or urea [(NH2)2CO] can be used by road crews to melt ice on roads, but solutions of CaCl2 are generally used instead. Assuming equal costs per pound of substance, why is CaCl2 used instead of table sugar or urea?
Which solute has the greatest effect on the boiling pointof 1.00 kg of water: 50.0 g of strontium chloride (SrCl2) or 150.0 g of carbon tetrachloride (CCl4) ? Justify youranswer.
Sodium chloride (NaCl) is commonly used to melt ice on roads during the winter. Calcium chloride (CaCl2) is sometimes used for this purpose too. Let us compare the effectiveness of equal masses of these two compounds in lowering the freezing point of water, by calculating the freezing point depression of solutions containing 200. g of each salt in 1.00 kg of water. (An advantage of CaCl2 is that it acts more quickly because it is hygroscopic, that is. it absorbs moisture from the air to give a solution and begin the process. A disadvantage is that this compound is more costly.)
The following table lists the concentrations of the principal ions in seawater: (a) Calculate the freezing point of seawater. (b) Calculate the osmotic pressure of seawater at 25 C. What is the minimum pressure needed to purify seawater by reverse osmosis?
Specifications for lactated Ringers solution, which is used for intravenous (IV) injections, are as follows to reach 100. mL of solution: 285315 mg Na+ 14.117.3 mg K+ 4.9Q.O mg Ca2+ 368408 mg Cl 231261 mg lactate, C3H5O3 a. Specify the amount of NaCl, KCl, CaCl2 2H2O, and NaC3H5O3 needed to prepare 100. mL lactated Ringers solution. b. What is the range of the osmotic pressure of the solution at 37C, given the preceding specifications?
A gaseous mixture consists of 87.0 mole percent N2 and 13.0 mole percent O2 (the approximate composition of air). Suppose water is saturated with the gas mixture at 25C and 1.00 atm total pressure, and then the gas is expelled from the water by heating. What is the composition in mole fractions of the gas mixture that is expelled? The solubilities of N2 and O2 at 25C and 1.00 atm are 0.0175 g/L H2O and 0.0393 g/L H2O, respectively.

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