A 1.0-gram sample of NaCl(s) is dissolved in 100. grams of water at 25°C, and another 1.0-gram sample of NaCl(s) is dissolved in 50. grams of water at 25°C. Which property of the two resulting mixture

NY Regents Chemistry Exam August 2023 Question 15

15 A 1.0-gram sample of NaCl(s) is dissolved in 100. grams of water at 25°C, and another 1.0-gram sample of NaCl(s) is dissolved in 50. grams of water at 25°C. Which property of the two resulting mixtures will be different?

(1) color of the components in the mixture

(2) particle size of the components in the mixture

(3) polarity of the components in the mixture

(4) proportion by mass of the components in the

mixture

Solution: The question talks about dissolving 1 g of NaCl in 100 grams of water versus 50 grams of water. Proportion by mass would be the only property that would change since in the first mixture we would have 1g of NaCl in 100 g and in the second mixture we would have 1g of NaCl in 50 g. Choice 4

Polarity, particle size and color are independent of the amount of solvent the solute dissolves in.

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