Solve M₁V₁ = M₂V₂ for whichever of the four values you leave blank — the standard way to plan a dilution from a stock solution.
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From the article Dilution Formula M₁V₁ = M₂V₂ — When It Works and When It Fails.
25.0 mL of 2.00 M HCl is diluted with water to a final volume of 250 mL. Find M₂.
M₁ = 2.00 M, V₁ = 25.0 mL, V₂ = 250 mL
M₂ = M₁V₁ ÷ V₂ = (2.00 × 25.0) ÷ 250 = 50.0 ÷ 250 = 0.200 M
Sanity check: the volume went up 10 times, so the concentration should drop 10 times. 2.00 ÷ 10 = 0.200. ✔
Worked in full in Dilution Formula M₁V₁ = M₂V₂ — When It Works and When It Fails.
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