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The original solution is composed of 0.100 mol acetic acid (CH3COOH). NaCH3COO∙3H2O will be added to raise the pH to 4.00.
CH3COOH is a weak acid (and based on the Bronsted-Lowry definition, an acid is a proton (H+) donor. Once CH3COOH loses its proton, its conjugate base is formed).
CH3COOH(aq) + H2O(l) ⇌ CH3COO-(aq) + H3O+(aq)
(weak acid) (base) (conjugate base) (conjugate acid)
A solution contains 1.00 mole of acetic acid and has pH = 2.50. How many grams of NaCH3COO·3H2O (of MW 136) should be dissolved in the solution to raise the pH to 4.00?
1. 10 g
2. 35 g
3. 20 g
4. 15 g
5. 24 g
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