Multiple Choice
To 225 mL of a 0.80 M solution of KI, a student adds enough water to make 1.0 L of a more dilute KI solution. What is the molarity of the new solution?
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6. Chemical Quantities & Aqueous Reactions
Dilutions
Multiple Choice
What is the final volume when 20.00 mL of 3.00 M NaCl solution is diluted to a final concentration of 0.100 M?
A
300.00 mL
B
200.00 mL
C
600.00 mL
D
60.00 mL
Verified step by step guidance1
Start by understanding the concept of dilution, which involves adding solvent to a solution to decrease its concentration. The number of moles of solute remains constant before and after dilution.
Use the dilution formula: \( C_1V_1 = C_2V_2 \), where \( C_1 \) and \( V_1 \) are the initial concentration and volume, and \( C_2 \) and \( V_2 \) are the final concentration and volume.
Identify the given values: \( C_1 = 3.00 \) M, \( V_1 = 20.00 \) mL, and \( C_2 = 0.100 \) M. You need to find \( V_2 \).
Rearrange the dilution formula to solve for \( V_2 \): \( V_2 = \frac{C_1V_1}{C_2} \).
Substitute the known values into the equation: \( V_2 = \frac{3.00 \times 20.00}{0.100} \). Calculate \( V_2 \) to find the final volume.
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