Question

the pH of solution is 4.0 what would be the change in the hydrogen ion concentration of the solution, if its pH is to be increased to 5.0​

Answer 1

Any pH can increase 10 times. You may start at .00001 M or pH 5. Add until .0001 M or pH4. It increase 10 times by shifting one decimal to left.

Another sample with pH has .0001 M or pH 4. Then increase concentration to .001 or pH 3.

Any H concentration can give 10 times more concentration than what it begins with will decrease (reduce) pH reading by 1.

Additional comment. If pH reading is 0, the H concentration is 1 M. The pH is zero because there is no decimal change from 1. 1 is same as 1.0. The pH scale from 0 to 14. It is a ZEROES counter. It counts zeroes. If the counter says 8, it s