(a) What effect does the concentration of H⁺ (aq) ions have on the nature of a solution?
(b) What effect does the concentration of OH^–ions have on the nature of a solution?
(c) Someone put some universal indicator paper into vinegar. The pH is 3. What does this tell you about the vinegar?
(d) Someone put some universal indicator paper onto wet soap. The pH is 8. What does this tell you about the soap?
(e) State whether a solution is acidic, alkaline or neutral if its pH is :

(i) 9 (ii) 4 (iii) 7 (iv) 1 (v) 10 (vi) 3

Academic Chemistry NCERT Class 10

(a) The solution becomes more acidic when the concentration of hydrogen, H+ (aq) ion increases.

(b) The solution become more basic as the concentration of hydroxide, OH– ions increases.

(c) Value of pH less than 7 shows that the solution is acidic. Hence, the pH of 3 shows that vinegar is acidic in nature.

(d) Value of pH more than 7 shows that the solution is basic. Hence, the pH of 8 shows that soap is basic in nature.

(e) (i) pH = 9, then the solution is Alkaline.

(ii) pH = 4, then the solution is Acidic.

(iii) pH = 7, then the solution is Neutral.

(iv) pH = 1, then the solution is Acidic.

(v) pH = 10 , then the solution is Alkaline.

(vi) pH = 3, then the solution is Acidic.

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Updated on: 10-Oct-2022

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