(Solved): PRE-LAB CALCULATIONS: 100mL of red food coloring solution, 1000ppm will be prepared using a 2.5% ...

PRE-LAB CALCULATIONS: $$100\mathrm{mL}$$ of red food coloring solution, $$1000\mathrm{ppm}$$ will be prepared using a $$2.5\%$$ solution (from local store). 1. Calculate the required amount of $$2.5\%$$ red food coloring solution to prepare $$100\mathrm{mL}$$ of $$1000\mathrm{ppm}$$ (stock solution): Note: $$1\%=10,000\mathrm{ppm}$$ $$C_1{V}_1=C_2{V}_2$$ 2. Calculate the required amount of stock solution needed to prepare $$500\mathrm{mL}$$ of $$10\mathrm{ppm}$$ red food coloring solution (working solution). 3. Calculate the required volume of $$10\mathrm{ppm}$$ red food coloring needed to prepare 25 - or 50 -mL solutions of the following concentrations: $$2,4,6$$, and $$10\mathrm{ppm}$$.