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The pH value of a solution determines whether it is acidic, basic or neutral in nature. 1. The concentration of hydrogen ion in the sample of a soft drink is 3.8 × 10-3 mol/L. Calculate its pH. Also predict whether the above solution is acidic, basic or neutral.2. The dissociation constants of formic acid (HCOOH) and acetic acid (CH3COOH) are 1.8 × 10-4 and 1.8 × 10-4 respectively. Which is relatively more acidic? Justify your answer. |
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Answer» 1. pH = – log[H+] = – log[3.8 × 10-3] = 2.42 Since pH is less than 7, it is an acidic solution, 2. HCOOH is more acidic. Ka value is directly proportional to the acid strength, i.e., greater the Ka value, stronger is the acid. |
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