Determining the Concentration of the Final Solution

What does a chemistry teacher add to create the final solution?

A. 50.0 mL of 1.50 M H2SO4 solution

B. 200 mL of water

C. Both A and B

What is the concentration of the final solution?

A. 0.300 M

B. 0.375 M

C. 6.00 M

D. 7.50 M

Answer:

The concentration of the final solution is 0.300 M

To solve this problem, the chemistry teacher added 50.0 mL of 1.50 M H2SO4 solution to 200 mL of water. The total volume of the final solution would be the sum of the volume of the H2SO4 solution and water, which is 50.0 mL + 200 mL = 250 mL.

First, we need to calculate the moles of H2SO4 in the initial solution:

Moles of H2SO4 = Volume of H2SO4 solution (L) * Concentration of H2SO4 (M)

Moles of H2SO4 = 0.050 L * 1.50 M = 0.075 mol

Since the volume of water is much larger, the moles of H2SO4 in the final solution will be the same as the initial solution. To find the concentration of the final solution, divide the moles of H2SO4 by the total volume of the final solution:

Concentration of the final solution = Moles of H2SO4 / Total volume of the final solution

Concentration of the final solution = 0.075 mol / (0.050 L + 0.200 L) = 0.300 M