How do I make a Vitamin C standard solution?

When I do, what do i do next to test which fruits or fruit juices have the greatest vitamin c content?? plz help, a 9th grade science project

I have red blotchy skin. Besides when I wear make up. I was thinking of using a mint julip mask, then a sugar scrub. At night I would add Vitamin E oil. Is there a better solution for skin redness?

I Used Uk Erase Solution which contains vitamin A for faster peeling action and AHA (alpha hydroxyl acids) (malic acid), milk (lactic acid), sugar cane (glycolic acid) and bark of trees (salicylic acid) . I used it for my pimples and now it has a peeling...

vitamin C are in a vitamin C containing sample if 10.03mL of the NaOH solution is needed to exacly neutralize the vitamin C in the sample. ('Do not' use the molar mass of vitamin C or calculate the molarity of the NaOH solution in this problem.)

I'm given Molar mass 34.0147 g/mol Density 1.463 g/ cm3 So moles = mass/ molar mass 20/1000 moles = mass / 34.0147 g/mol so 0.6803 g h202 needed in 1 L of solution for a 20 mM solution 0.6803 g converted to ml is mass/volume = density 0.6803 g/ 1....

a) Determine the concentrations of H3O+ and HCOO ‾ in this solution. H3O+ concentration-->.00711 (correct) HCOO ‾ concentration-->.00711(correct) (b) Determine the H3O+ concentration that would be necessary to decrease the HCOO ‾ concentration...