2. You have been asked to make several NaCI solutions. The formula weight of NaC
ID: 573623 • Letter: 2
Question
2. You have been asked to make several NaCI solutions. The formula weight of NaCl is 58.4 g/mole. Calculate how much NaCl you would need to measure out to make 2 1 of a 12% solution of NaC1. Show your work. THEN, describe the steps needed to physically make these solutions (NOT CALCULATIONS). (6 pts) A. Calculate how much NaCI you would need to measure out to make 100 mL of each of the concentrations indicated in the table. 8. Show your work below (6 pts) NaCI Solution Volume needed Grams needed 0.9% 20 ml 10% 20 ml 20% 20 mlExplanation / Answer
2.
A.
12% NaCl means
12 g of NaCl in 100 mL solution.
or, 120 g of NaCl in 1000 mL solution.
or, 120 g of NaCl in 1 L solution.
or, 240 g of NaCl in 2 L solution.
Take 2 L of water (or solvent) in a container. Weigh 240 g of NaCl and add portion-wise into the container containing 2L of water. During adding NaCl keep continuously stirring.
B.
0.9% NaCL solution means
0.9 g of NaCl in 100 mL solution.
(0.9/5) g of NaCl in (100/5) mL solution.
0.18 g of NaCl in 20 mL solution.
10% NaCL solution means
10 g of NaCl in 100 mL solution.
(10/5) g of NaCl in (100/5) mL solution.
2.0 g of NaCl in 20 mL solution.
20% NaCL solution means
20 g of NaCl in 100 mL solution.
(20/5) g of NaCl in (100/5) mL solution.
4.0 g of NaCl in 20 mL solution.
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