Question

Hi friends! Please answer my doubts given below with the help of the pH chart attached above. This is from Class 10 Science Chapter 2 'Acids, Bases and Salts'. Please don't post anything irrelevant if you don't know the answer. Thanks! 1. Lemon juice has a pH of 2.2 and hence it is a strong acid and thus, it is highly corrosive. Yet how are we able to consume it safely? 2. What is the nature of the acid/base (strong/moderate/weak) at the following pH? 1) 3 2) 5 3) 10 4)12 3. Are there any acids of pH below 0 or Bases of pH above 14? Please give examples and their nature if there are any! Thanks!

Answer 1

1. Lemon juice in its natural state is acidic with a pH of about 2, but once metabolized it actually becomes alkaline with a pH well above 7. So, outside the body, anyone can see that lemon juice is very acidic. However, once fully digested, its effect is proven to be alkalizing with many health benefits.
2. (a) strong acid  (b) weak acid  (c) moderate base  (d) strong base
3. it is possible for a solution to have a negative pH, but it has to be a relatively concentrated solution of a strong acid.  For almost all weak acid solutions, or for dilute solutions of strong acids, the pH will be positive. Hence for the sake of simplicity, we take ph range from 0 to 14.

I hope this helps. Please mark my answer as the Brainliest.