A student is asked to prepare 400.0 mL of a 0.25M HCl solution. The students find a bottle labeled ""2.0M HCl."" How many mL of the 2.0M solution are needed to prepare the 0.25M solution?
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Ответ:
The answer to your question is He needs 50 ml of 2.0 M HCl.
Explanation:
Data
Volume 2 = 400 ml
[HCl] 2 = 0.25 M
[HCl] 1 = 2.0 M
Volume 1 = ?
To solve this problem use the dilution formula
Formula
V₁C₁ = V₂C₂
Solve for V₁
V₁ = V₂C₂ / C₁
Substitution
V₁ = (400)(0.25) / 2
Simplification
V₁ = 100 / 2
Result
V₁ = 50 ml
Ответ: