Five students, Ali, Bob, Chanda, Durga and Emmanuel, tested five different solution (one solution per student) separately with Universal Indicator showed pH as 4, 1, 11, 7 and 9 respectively. Whose solution is:

(i) Neutral (ii) Strongly alkaline (iii) Strongly acidic (iv) Weakly acidic (v) Weakly alkaline.p>

Academic Chemistry NCERT Class 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)

(The pH of a solution is a measure of the molar concentration of hydrogen ions in the solution and as such is a measure of the acidity or basicity of the solution.
The letters pH stand for "power of hydrogen" and numerical value for pH is just the negative of the power of 10 of the molar concentration of H+ ions.
To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per litre (molarity).
The pH is then calculated using the expression: pH = - log [H₃O⁺].

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Updated on: 10-Oct-2022

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