Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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A chemistry student weighs out 72. g of an unknown solid compound X and adds it to 550. mL of distilled water at 19.° C .After 10 minutes of stirring, only some of the X has dissolved. The student drains off the solution, then washes, dries and weighs the X that did not dissolve. It weighs 64. g
.
In a flask, you heat a mixture of 735.4 g of sodium nitrate and 700.0 grams of water until all of the sodium nitrate
has just been dissolved. At what temperature does this occur? When you examine the solution later, the
temperature is 25°C and you notice a white powder in the beaker. What has happened? What is the mas of the
white powder?
Solubility vs. Temperature
140
KI
130
120
NaNO,
gases
110
sólids
100
KNO,
90
80
HCI
NH,CI
70
60
NH3
KCI
50
40
NacT
30
KCIO,
20
10
SO2
0 10 20 30 40 50 60 70 80 90 100
Temperature °c
Solubility (grams of solute/100 g H2O)
Density of an aqueous solution of nitric acid is 1.43 g/mL. If this solutioin contained 36.0% nitric acid by mass, what volume of solution would be needed to supply 1.50 mmol of nitric acid?
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- Suppose that you are closing a cabin in the north woods for the winter and you do not want the water in the toilet tank to freeze. You know that the temperature might get as low as 30. C, and you want to protect about 4.0 L water in the toilet tank from freezing. Calculate the volume of ethylene glycol (density = 1.113 g/mL; molar mass = 62.1 g/mol) you should add to the 4.0 L water.arrow_forwardBeakers (a), (b), and (c) are representations of tiny sections (not to scale) of mixtures made from pure benzene and pure water. Select which beaker gives proper representation of the result when the two pure substances are mixed.arrow_forwardWhat mass of solid NaOH (97.0% NaOH by mass) is required to prepare 1.00 L of a 10.0% solution of NaOH by mass? The density of the 10.0% solution is 1.109 g/mL.arrow_forward
- Potassium sulfate has a solubility of 15 g/ 100 g water at 40C. A solution is prepared by adding 39.0 g of potassium sulfate to 225 g of water, carefully heating the solution, and cooling it to 40C. A homogeneous solution is obtained. Is this solution saturated, unsaturated, or supersaturated? The beaker is shaken, and precipitation occurs. How many grams of potassium sulfate would you expect to crystallize out?arrow_forwardWhat is the difference between (a) mass and density? (b) an extensive and an intensive property? (c) a solvent and a solution?arrow_forwardA soft drink contains an unknown mass of citric acid, C3H5O(COOH)3. It requires 6.42 mL of 9.580 × 10−2-M NaOH to neutralize the citric acid in 10.0 mL of the soft drink. C3H5O(COOH)3(aq) + 3 NaOH(aq) → Na3C3H5O(COO)3(aq) + 3 H2O(ℓ) Determine which step in these calculations for the mass of citric acid in 1 mL soft drink is incorrect? Why? n (NaOH) = (6.42 mL)(1L/1000 mL)(9.580 × 10−2 mol/L) n (citric acid) = (6.15 × 10−4 mol NaOH) × (3 mol citric acid/1 mol NaOH) m (citric acid in sample) = (1.85 × 10−3 mol citric acid) × (192.12 g/mol citric acid) m (citric acid in 1 mL soft drink) = (0.354 g citric acid)/(10 mL soft drink) Determine the correct result.arrow_forward
- If 14.5 kJ of heat were added to 485 g of liquid water, how much would its temperature increase?arrow_forwardThe solubility of NaCl in water is 35.7 g/100 mL at 25 degrees Celcius. If 100. g of NaCl is added to 200 mL of water at 25 degrees Celsiud, how much NaCl will remain undissolved?arrow_forward
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