chem solutions and dilutions

1. How many moles of NaCl are present in 250 mL of a 0.40 M NaCl solution?

n = c x v

2. What is the molarity of a solution containing 3.0 mol of solute in 1.5 L of solution?

c = n/v

3. How many grams of KCl (M = 74.55 g·mol⁻¹) are needed to prepare 0.500 L of a 0.250 M solution?

n = c x v → m = nM

4. A 2.00 M HCl solution is diluted to make 500 mL of 0.500 M solution. What volume of the original solution was used?

m1v1 = m2v2

5. What is the volume of a 1.20 M NaOH solution required to contain 0.300 mol of NaOH?

v = n/c

6. If 5.0 g of NaOH (M = 40.00 g·mol⁻¹) is dissolved to make 250 mL of solution, what is its concentration?

n = m/M → c = n/v

7. A solution is prepared by diluting 25.0 mL of 6.00 M stock solution to a total volume of 500 mL. Find the new molarity.

m1v1 = m2v2

8. How many grams of solute are in 750 mL of a 1.50 M KNO₃ solution (M = 101.1 g·mol⁻¹)?

n = c x v → m =nM

9. 100 mL of 0.20 M Na₂SO₄ is mixed with 400 mL of water. What is the final concentration?

m1v1 = m2v2

1. How many moles are in 125 mL of a 0.75 M solution?

n = c x v