Question

174 Problems and questions 1. Compare and contrast the three methods used to test pH (red cabbage indicator, pH paper, and a pH meter). Did they give similar results? Which is the most accurate? Explain. 2. The hydroxide ion concentration of a solution is 2.5 x 10 M. What is the hydronium ion concentration? a) What is the pH? b) Is the solution acidic, basic, or neutral? c) 3. A few drops of HCl are added to two solutions, A and B. The pH of each solution is shown before and after the addition of HCI. Which solution is a buffer? Explain. Solution A Solution B Add drops of HCI Add drops of HCI pH-7.0 pH 3.0 pH-7.0 pH-6.9

Answer 1

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Page: - * Dr meter method - most accurate * all three method used to determine the nature of Solution to all three give similar Result Red Cabbage indicator - Red Cabbage indicator or Basic determine whether solution is Acidic PH paper Only determine sold solution is Acidic or Basic Du meter But Pn meter indicate actual Pn of Solution & it is electric device used to measure Tychogen 'ion activity 2 (9) kw = [ht] [on] → IX 10-14 = (x+] (2.5X10-8] = {4X 10 7 [HT] = 1x 10-14 2.5 Xto- 14X 10 O DH = -log [ut] → PH = -log (4 X10 - 7] PH = 6.39 (6) PH = 7 Neutral ph77 Basic PUL7 & Acidic ANS = Acidic because PuL7 3) Solution B' is a buffer solution Buffer Solution. Because solution B' Pn Changes very little when a Small amount of strong Acid has is added to it In solution and after adding hcl pn Change very large