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How many L of 3.0 M NaCl is needed to make up a 5.0 L solution of 2.0 M NaCl?

a. 3.0 L
b. 1.5 L
c. 2.5 L
d. 4.0 L

1 Answer

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Final answer:

To make a 5.0 L solution of 2.0 M NaCl, approximately 3.33 L of 3.0 M NaCl is needed. The closest option is 4.0 L.

Step-by-step explanation:

To find out how many liters of 3.0 M NaCl are needed to make a 5.0 L solution of 2.0 M NaCl, we can use the formula:

M1V1 = M2V2

Where M1 and V1 are the initial concentration and volume, and M2 and V2 are the final concentration and volume. So, plugging in the values:

(3.0 M)(x L) = (2.0 M)(5.0 L)

3x = 10

x = 10/3 = 3.33 L

Therefore, approximately 3.33 L of 3.0 M NaCl is needed to make up a 5.0 L solution of 2.0 M NaCl. Since the answer options are given in whole numbers, the closest option would be 4.0 L.

User Glenn Maynard
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