Question

How much 2.0 M NaCl solution would you need to make 250 mL of 0.15 M NaCl solution?

Answer 1

To make 250 mL of 0.15 M NaCl solution from a 2.0 M NaCl solution, you would need 18.75 mL of the 2.0 M NaCl solution.

Step-by-step explanation:

To determine the amount of 2.0 M NaCl solution needed to make 250 mL of 0.15 M NaCl solution, we can use the formula:

C1V1 = C2V2

Where:

• C1 = initial concentration (2.0 M)
• V1 = initial volume (unknown)
• C2 = final concentration (0.15 M)
• V2 = final volume (250 mL)

Using these values, we can rearrange the formula to solve for V1:

V1 = C2 * V2 / C1

Substituting the values, we get:

V1 = 0.15 M * 250 mL / 2.0 M

Calculating this, the amount of 2.0 M NaCl solution needed is 18.75 mL.

Answer 2

18.75 mL

Step-by-step explanation:

(M1)(V1)=(M2)(V2)

(2.0 M)(V1)=(0.15 M)(250 mL)

(2.0)(V1)=37.5

Divide 2.0 on both sides

V1=18.75 mL