How can you increase the solubility of CO_2 in a sample of water? Pour the sampl

Question

How can you increase the solubility of CO_2 in a sample of water? Pour the sample into a bigger container Add 100 mL of water Heat the solution Increase the pressure of CO_2 above the solution. None of the above an isotonic solution of boric acid (H_3 BO_3) is used to treat eye infection. How many grams of boric acid would you need to make 4 liters of an isotonic solution? Assume no ionization of this weak acid 247.2 g 17.3 g 61.8g 69.2 g none of the above Drinking warm chicken soup relieves the pain of a sore, swollen throat when you are sick because... The acidity of the salt reacts with pain receptors. The basic viruses react with the acidity of the salt. The salt increases the pH of your throat. The high solute concentration pulls water out of the swollen tissue in your throat. The salt tastes good. In hot weather, the air over urban areas appear to have a greater brown color. Given that NO_2 (a significant air pollutant) is brown and N_2 O_4 is colorless, what can you say about the following reaction as written? 2NO_2 - N_2 O_4 Delta H= -13.7 kcal the reaction requires heat to proceed to the right. There are more molecules after the reaction proceeds to the right. As the reaction proceeds to the right, the pressure will increase in a closed container. The reaction is exothermic All of the above

Explanation / Answer

# 53 Answer: D) increase the pressure of CO2 above the solution.

By Henry's law, the solubility of a gas in a solvent depends on the pressure of the gas.

Pgas = KhC where P is the pressure of the gas, Kh is Henry's gas constant and C is the concentration of HCO3-

#54 Answer: There is no ionization of boric acid, which means 1 molar boric acid solution equals 1 osmolar solution i.e concentration remains the same for isotonicity.

1 M = 1 mole L-1 = weight of boric acid/molar mass of boric acid/volume of the solvent in liters

==> 1 mole L-1 = weight of boric acid/molar mass of boric acid x volume of the solvent in liters

==> 1 mole L-1 = weight of boric acid/61.8 g mol-1 x 4 L

==> weight of boric acid = 1 mole L-1 x 61.8 g mol-1 x 4 L = 247.2 g

A) is the answer.

# 55 answer: D) the high solute concentration pulls water out of the swollen tissue in your throat.

since chicken is acting like a hypertonic solution so it will drain out water from the tissue to maintain isotonicity.

# 56) answer: D) the reaction is exothermic since deltaH is negative.

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