Question

How many milliliters of 7.10 M hydrobromic acid solution should be used to prepare 5.50 L of 0.400 M HBr

Answer 1

310 mL

Step-by-step explanation:

Step 1: Given data

• Initial concentration (C₁): 7.10 M

• Initial volume (V₁): ?

• Final concentration (C₂): 0.400 M

• Final volume (V₂): 5.50 L

Step 2: Calculate the initial volume

We have a concentrated HBr solution and we want to prepare a diluted one. We can do so using the dilution rule.

C₁ × V₁ = C₂ × V₂

V₁ = C₂ × V₂ / C₁

V₁ = 0.400 M × 5.50 L / 7.10 M

V₁ = 0.310 L = 310 mL