Which substance is the most acidic? sodium hydroxide tomato juice lemon juice water

The correct answer is C. Lemon juice

Explanation:

The acidity of a solution depends mainly on their ph, in this way a pH from 0 to 6 indicates a substance is acid, a pH of 7 shows the substance is neutral and a higher pH shows a substance is a base which is the opposite to acids as bases accept hydrogen ions if dissolved while acids release them. Also, the lower the pH the most acidic a solution is. In this way, lemon juice has a pH of 2 and therefore is the most acidic in comparison to tomato juice with a pH of 4, water with a pH of 7 (neutral pH) and sodium hydroxide with a pH of 12 (base).

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."