A lemon has a pH that ranges from 2-3. Though lemons are highly acidic on the pH scale, they have an alkaline effect on the body.
1 cup
about 40% of a lemon is juice the rest of it is skin and lumpy mush
Well it depends on how much zest comes out of the lemon. A little or a lot of zest can come out depending on its size.
It all depends on the lemon so you can never be sure. A few tablespoons normally.