Nitrates, found in processed meats, especially cold cuts, sausages, bacon, and f

Question

Nitrates, found in processed meats, especially cold cuts, sausages, bacon, and form hotdogs, nitrogen dioxide free radicals during digestion. This reacts with oxygen in the blood stream activating it to a free radical as well. Once formed, free radicals attack, taking electrons from cell constituents, including from nucleic acid in DNA in the nucleus of cells. These mutations lead to cancer. Antioxidants, such as B-carotene and beta, found in vegetables aid a body's immune system in elimination of singlet molecular oxygen. A reaction example is as follows: O_2 + beta-carotene rightarrow O_2 + excited- beta -carotene + heat 1.8426 mg of beta -carotene (f.w. = 536.87 g/mole) is dissolved in. (this is the amount of beta carotene found in one organically grown carrot some commercially carrots can have the nutritional value of a paper towell) It is titrated with 0.307 M solution of free radical activated oxygen. How many ml of the titrant solution were used?

Explanation / Answer

Mass of -carotene= 1.8426 mg = 0.0018426 g

FW of -carotene = 536.87 g/mol

no of moles of -carotene = 0.0018426/536.87 = 3.42 * 10-6 mol

thus no of moles of activated oxygen required = 3.42 * 10-6 mol

volume of activated oxygen required = no of moles/ molarity = 3.42 *10-6 / 0.307 = 1.11 * 10-5 L

volume of activated oxygen required (titrant required) = 1.11 * 10-5 L = 0.011 mL

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