3. organic (carbon containing) compounds: For the following vitmains, fill in th

Question

3. organic (carbon containing) compounds: For the following vitmains, fill in the following data including your reference letter for each piece of data, as you may need to look in different MSDS sources. (Try to get specifc numbers in order to compare and answer the questions below! Item Vitamin D Vitamin C Vitamin A Vitamin B3 Niacin, Chemical name Retinol Chemical Formula C20H300 Molecular Weight 286.451 176 124 units m Melting Point 63.5 units Water sdubults units 9/L verg sduble nclude Temp if given in reld sader LDso (lo daj)in LDso and method (LDsa ORAL rat xx) mice (mg/ka) 150o LDso- the lethal dose to kill 50% of population or a 50% chance to kill one individual. Be sure to note the units for your particular source. May need to look them up! (often mg/kg body wt) Generally found in the Toxicology section Questions: (nclude th's as Evidence!) b. Which would melt first on heating? a. Which vitamin above is the most soluble in water? c. Which has the lowest LDse? Which is more toxic, a high LDsa number or a low one? Why? d. How many grams of the most dangerous would it take to (likely) kill a 175 pound person? e. What would the LDso concentration of the least dangerous be in terms of percent by mass?

Explanation / Answer

LD values for vitamins

Vitamin A : 625 x 10^-6 g/kg

Vitamin B3 : 3 g/kg

Vitamin C : 11.9 g/kg

Vitamin D : 1 x 10^-3 g/kg

So,

a. Most water soluble vitamin is Vitamin C

b. Lowest melting point Vitamin is Vitamin A

c. Lowest LD50 is for Vitamin A. Most toxic vitamin would have lowest LD50 value

d. for a 175 lb (79.4 kg) person, the amount of Vitamin A needed = 0.05 g for toxic level

e. concentration of least toxic Vitamin C = 11.9 x 100/1000 = 1.19%

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