_{}_{}

If someone knows any link from where I can take the precise amounts of Na_{2}S_{2}O_{3}, H_{2}SO_{4}, KI, starch as well as the exact formula for determination of H_{2}O_{2}, from a sample that it suppose to have 30% concentration of H_{2}O_{2}, please send it to me.

Thx in advance for any useful answer regarding my problem.