Which of the following is true regarding the solubility of gases? Which of the f

Question

Which of the following is true regarding the solubility of gases? Which of the following terms can be used to quantitatively describe the concentration of a solution? Suppose you prepare a solution by mixing a known volume of ethanol (density = 0.789 g/mL) with a known volume of water (density = 1.00 g/mL). Which of the following can be determined from the information given? What is the weight of salt in a 400 gram sample of salt water which is 1.50% (w/w)? An aqueous solution is found to have a density of 1.04 g/mL. It the solution was prepared by dissolving 45.0 grams in enough water to make 1.00 liter of solution, what is the concentration of the solution expressed as %(w/v)? Which of the following is the definition of molarity? If we know the solute and the molarity of a solution which other concentration unit can we readily determine without any other measurements?

Explanation / Answer

15) (b) solubility always increases as pressure increases in case of gases (Henry's Law)

16) (c) molar [molar concentration = moles of solute/volume of solution in litres]

17) (c) both a and b can be determined

18) [mass of salt/total mass of solution]*100 = 1.5

or, mass of salt = 0.015*400 = 6 g

so, the correct option is (d)

19) (a) 4.33% (w/v)

20) (b)

21) (b) (w/v)%

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