Five solutions A, B, C, D, and E when tested with universal indicator showed pH as 4, 1, 11, 7, and 9 respectively. Which solution is?
(i) Neutral?
(ii) Strongly alkaline?
(iii) Strongly acidic?
(iv) Weakly acidic?
(v) Weakly alkaline? Arrange the pH in increasing order of hydrogen-ion concentration.

AcademicChemistryNCERTClass 10

i> Neutral- Durga's solution is neutral (pH= 7)
ii> Strongly Alkaline- Chanda's solution is strongly alkaline (pH=11)
iii> Strongly Acidic- Bob's solution is strongly acidic (pH=1)
iv> Weakly Acidic - Ali's solution is weakly acidic (pH=4)
v> Weakly Alkaline- Emmanuel's solution is weakly alkaline ( pH=9) 

[Extra information: pH stands for "power of hydrogen".The "H" is capitalized because it is the hydrogen element symbol. 
Acidic and basic are two extremes that describe a chemical property chemical. The pH scale measures how acidic or basic a substance is. 
  • The pH scale ranges from 0 to 14.
  • A pH less than 7 is acidic in nature.
  • A pH of 7 is neutral.
  • A pH greater than 7 is basic in nature.
pH decreases with an increase in temperature. This does not mean that the water becomes more acidic at higher temperatures.

A solution is considered acidic if there is an excess of hydrogen ions (H) over hydroxide ions (OH-).

(Refer to image for better understanding)
Updated on 10-Oct-2022 12:46:26