Textbook Question
One brand of laundry bleach is an aqueous solution containing 4.55% sodium hypochlorite (NaOCl) by mass. What is the molarity of this solution? (Assume a density of 1.02 g/mL.)
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Ch.13 - Solutions
Chapter 13, Problem 69
Which beaker shows a greater decrease in liquid level after being left side by side on a lab bench for 1 week, a beaker with 100.0 mL of pure water or a beaker with 100.0 mL of seawater, and why?
Verified step by step guidance1
<Identify the key difference between pure water and seawater: Pure water is composed solely of H2O molecules, while seawater contains dissolved salts and other substances.>
<Understand the concept of evaporation: Evaporation is the process where liquid molecules escape into the gas phase. It occurs more readily in pure substances due to fewer intermolecular forces compared to solutions.>
<Consider the effect of dissolved salts in seawater: The presence of salts in seawater increases the boiling point and decreases the vapor pressure compared to pure water, which means seawater evaporates more slowly.>
<Compare the evaporation rates: Since pure water has a higher vapor pressure than seawater, it will evaporate more quickly under the same conditions.>
<Conclude which beaker shows a greater decrease: The beaker with pure water will show a greater decrease in liquid level after one week due to its higher evaporation rate.>
Related Practice
Textbook Question
An aqueous solution contains 36% HCl by mass. Calculate the molality and mole fraction of the solution.
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Open Question
An aqueous solution contains 5.0% NaCl by mass. How do you calculate the molality and mole fraction of the solution?
Textbook Question
Which solution has the highest vapor pressure? a. 20.0 g of glucose (C6H12O6) in 100.0 mL of water b. 20.0 g of sucrose (C12H22O11) in 100.0 mL of water c. 10.0 g of potassium acetate KC2H3O2 in 100.0 mL of water
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Textbook Question
Calculate the vapor pressure of a solution containing 24.5 g of glycerin (C3H8O3) in 135 mL of water at 30.0 °C. The vapor pressure of pure water at this temperature is 31.8 torr. Assume that glycerin is not volatile and dissolves molecularly (i.e., it is not ionic), and use a density of 1.00 g/mL for the water.
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Open Question
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 12.35% naphthalene by mass. Calculate the vapor pressure of hexane above the solution at 25 °C. The vapor pressure of pure hexane at 25 °C is 151 torr.