L-ascorbic acid is another name for Vitamin C.
Vitamin C or L-ascorbic acid is an essential nutrient for humans, in which it functions as a vitamin. Ascorbate (an ion of ascorbic acid) is required for a range of essential metabolic reactions in all animals and plants. It is made internally by almost all organisms; notable mammalian exceptions are most or all of the order chiroptera (bats), and the entire suborder Anthropoidea (Haplorrhini) (tarsiers, monkeys and apes). It is also needed by guinea pigs and some species of birds and fish. Deficiency in this vitamin causes the disease scurvy in humans. It is also widely used as a food additive.
Probably not. You need to look at other sources such as how old is the plaster or pool among many others.
Due to the acidity and sugar concentration of different fruits, certain fruit combinations are easier to digest than others. Acid fruits combine well with sub-acid fruits. Sub-acid fruits combine well with sweet. However, acid fruits do not mix well with sweet fruits. Also, because of their particularly high water content, melons are the fastest to digest and therefore should be eaten alone.
Acid: Clementines, cranberries, grapefruit, kiwis, lemons, limes, oranges, pineapples, pomegranates, strawberries, tangerines.
Subacid: apples, apricots, berries, cherries, grapes, nectarines, peaches, pears, plums.
Sweet: bananas, dates, dried fruit, fresh figs, grapes (Muscat or Thomson), mangoes, papayas.
Melons: canary, cantaloupe, casaba, Christmas, honeydew, musk, Persian, watermelon.
The interesting thing is if you add a carrier like yogurt, what doesn't seem to go together actually ends up as a great combination. An example: bananas go well with strawberries in a yogurt smoothie.
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Papayas, a cup of strawberries and Kiwis all have more vitamin C levels in each of them than there would be in one orange.
This site gives a breakdown. Kiwis and strawberries have more Vitamin C than oranges.