Lemon juice has a pH of 2. What is the hydrogen ion concentration of lemon juice?

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

In which environment would primary succession occur? a forest with a few remaining trees after a recent wildfire an area of exposed rock after a glacier melts away beach that is exposed to the air at low tide an abandoned baseball field in a small town

The most common form of matter in the universe