Using equation MsVs = MdVd (where Ms - molarity of stock solution, Vs - volume of stock solution, Md - molarity of diluted solution and Vd - volume of diluted solution) we can find Vs:
"V_s = \\frac{M_dV_d}{M_s} = \\frac {0.2\\frac{mol}{L} \\cdot 0.1 L}{1.0 \\frac{mol}{L}}=0.02 L = 20 mL"
Thus, to prepare 100 mL of diluted solution we should measure 20 mL of concentrated stock solution and then add water to reach 100 mL.
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