Q33 of 270 Page 79

What would you expect the pH of pure water to be?

A neutral solution, such as distilled water has value of hydrogen ion concentration equal to 7 on pH scale.

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31 What is meant by strong bases and weak bases? Classify the following into strong bases and weak bases:

NH4OH, Ca(OH)2, NaOH, KOH, Mg(OH)2

 32 What ions are present in the solutions of following substances? (write the symbols only)

(i) Hydrochloric acid (ii) Nitric acid (iii) Sulphuric acid (iv) Sodium hydroxide (v) Potassium hydroxide (vi) Magnesium hydroxide

 33 What colour would the universal indicator show in an aqueous solution of sugar? Why? 33 A sample of rain water turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid?