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PART - 1 CH - 2 Acids, Bases and Salts — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10SciencePART - 1 CH - 2 Acids, Bases and Salts4 Marks
Question
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 ________
a) neutral
b) Strongly alkaline?
c) Strongly acidic?
• Arrange the pH in increasing order of hydrogen-ion concentration.
✓

Answer

  • A = pH 4
  • B = pH 1
  • C = pH 11
  • D = pH 7
  • E = pH 9
a) Neutral Solution:
A neutral solution has a pH of 7. So, solution D is neutral.
b) Strongly Alkaline:
A strongly alkaline solution has a high pH, typically above 10. In this case, solution C (pH 11) is strongly alkaline.
c) Strongly Acidic:
A strongly acidic solution has a very low pH, usually below 3. Here, solution B (pH 1) is strongly acidic.
Arrange the pH in increasing order of hydrogen-ion concentration:
The concentration of hydrogen ions ([H+][H^+][H+]) increases as pH decreases. So, the order in terms of increasing hydrogen-ion concentration is:

B (pH 1) < A (pH 4) < D (pH 7) < E (pH 9) < C (pH 11).

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