Please answer all questions.

1			What good does it do somebody to take sodium bicarbonate for heartburn?
2			If the pH of orange juice is 4, how many more hydrogen atoms are released in the juice compared to coffee (pH 5)?
3			Vitamin A (i.e., retinol) consists primarily of a long chain of -CH2- groups. If you are given only this much information, what will vitamin A dissolve in more easily: oil or water?
4			If you were to use an organic chemical as a detergent to remove grease stains on your shirt (caused by a moment of carelessness with those French fries), which kind would you use and why?