Question

4. A student prepared had a concentration of 15 drops/L. The procedure. Calculation the concentrations of solu solution, complete with equations, units, and the correct number of 518 Pay attention to units! olutions using the serial dilution method. The stock solution ation of 15 drops/L. The solutions were prepared according the following alculation the concentrations of solutions A-D. Show the calculation for each ns, units, and the correct number of significant figures. Solution A: 50.0 mL Stock Solution and 50.0 mL deionized water Solution B: 50.0 mL Solution A and 50.0 mL deionized water Solution C: 50.0 mL Solution B and 50.0 mL deionized water Solution D: 50.0 mL Solution C and 50.0 mL deionized water

Please show work and accurate significant figures.

Thank you.

Answer 1

The concentrations of the solutions are calculated by dilution ratio:

Ca = C1 * V1 / Va = 15 drops / L * 50 mL / 100 mL = 7.5 drops / L

Cb = 7.5 drops / L * 50 mL / 100 mL = 3.75 drops / L

Cc = 1,875 drops / L

Cd = 0.9375 drops / L

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