Answer is: volume of 1 M NaOH is 1 ml. c₁(NaOH) = 1 M. V₂(NaOH) = 10 ml. c₂(NaOH) = 0,1 M. V₁(NaOH) = ? c₁ - original concentration of the solution, before it gets diluted. c₂ - final concentration of the solution, after dilution. V₁ - volume to be diluted. V₂ - final volume after dilution. c₁ · V₁ = c₂ · V₂. V₁(NaOH) = c₂ · V₂ ÷ c₁. V₁(NaOH) = 0,1 M · 10 ml ÷ 1 M. V₁(NaOH) = 1 ml.
