Question

1. You have a stock solution of 35 % hydrogen peroxide. You need to make several dilutions for a reaction. Calculate how much volume of the stock hydrogen peroxide you need to make 50 mL of 10 % hydrogen peroxide. 2. Using the equation of the line from the graph below, calculate the concentration of hydrogen peroxide if 820 mL of foam is produced from the reaction with potassium iodide. Foam Production vs. Concentration H2O2 1500 y 49.534x R-0.9677 1000 500 0 0 5 10 15 Concentration ( %) H,O 3. Why is it important to set your intercept to zero when preparing your graph from the data of foam produced? Volume Foam 20

Answer 1

Pere gewen Stock solution of thO2 15 35% of tho2 concentration How we need to make 10% concentrated some soluson. so amount of thon needed a 50x10 a 5 m2 100 Since stock solution in 35% concentrated means that in loomL of solution there is 35 mL H2O2 is present so we need sme the 100 msh stock goch contains 35me tha 2. Sme thor can be obtaind by a 100 x8 = 114.3mL) so we will need some solution 14.3mhg stock solution to make 10%