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The pKa value for HSO3- is 7.19. What mole ratio of K2SO3 to KHSO3 is needed to prepare a buffer with a pH of 7.40? [SO32-] = [HSO3 A 1 liter solution contains 0.517 M acetic acid and 0.388 M potassium acetate. Addition of 0.194 moles of perchloric acid will: (Assume that the volume does not change upon the addition of perchloric acid.) Raise the pH slightly Lower the pH slightly Raise the pH by several units Lower the pH by several units Not change the pH Exceed the buffer capacity An aqueous solution contains 0.26 M nitrous acid. One liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant as each substance is added.) 0.26 mol NaCl 0.27 mol NaNO2 0.130 mol KOH 0.27 mol HCl 0.13 mol HCl
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