A chemist is beginning to prepare 100.0 mL of a solution to be labeled \"0.900%

Question

A chemist is beginning to prepare 100.0 mL of a solution to be labeled "0.900% (wt/vol) sodium chloride." To prepare this solution, the chemist would:

Question 4 options:

a) weigh 0.900 grams of sodium chloride into a container, add water to dissolve the sodium chloride, and then add water to produce 100.0 mL of solution. b) weigh 0.900 grams of sodium chloride into a container and add 100.0 mL of water to dissolve the sodium chloride. c) weigh 9.00 grams of sodium chloride into a container, dissolve the sodium chloride in water, and then add water to produce 100.0 mL of solution. d) add 100 mL of water to a 100 mL volumetric flask, and then add 0.900 grams of sodium chloride. e) weigh 0.900 grams of sodium chloride into a volumetric flask, add some hot water to dissolve the salt, and then dilute to the 100 mL mark with hot water.

Explanation / Answer

Option A is correct.

0.900% w/v means 0.9 g of NaCl present in 100.0 mL of solution.

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