Answer: A> B> C > D> E
Step-by-step explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
a) Solution A: pH =2
b) Solution B: pH =5
c) Solution C: pH = 7
d) Solution D: pH = 8
e) Solution E: pH =13
Thus the decreasing order of hydrogen ion concentration is A> B> C > D> E