Question

John and Alex were asked to make a 0.70 M solution. John measure out .35 L from the 2.0 M solution before asking how much solution was needed. Alex remembered that measured out solutions are never put back in the stock bottle so went ahead and used all that was measured out. How many liters of the 0.70 M solution was made?

Answer 1

1.0 L

Step-by-step explanation:

Given data

• Initial volume (V₁): 0.35 L

• Initial concentration (C₁): 2.0 M

• Final volume (V₂): ?

• Final concentration (C₂): 0.70 M

John and Alex prepared a diluted solution from a concentrated one. We can find the volume of the diluted solution using the dilution rule.

C₁ × V₁ = C₂ × V₂

V₂ = C₁ × V₁ / C₂

V₂ = 2.0 M × 0.35 L / 0.70 M

V₂ = 1.0 L