CBSE Class 10 Science 2019 · Paper 31/1/1/C · Question 7(a)
- (a)What does pH scale measure ?
- (b)Write its range.
- (c)State the significance of highest and lowest values of pH scale.
Answer
The pH scale measures hydrogen ion concentration, from 0 to 14; pH 0 is the strongest acid and pH 14 the strongest base.
(a) The pH scale measures the hydrogen ion concentration in a solution, that is, how acidic or basic the solution is.
(b) Its range is from to (with as neutral).
(c) The lowest value, pH , means the highest hydrogen ion concentration: a very strongly acidic solution. The highest value, pH , means the lowest hydrogen ion concentration (the highest hydroxide ion concentration): a very strongly basic (alkaline) solution.
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