CHEM 116 Exam 3 Practice Test Qs&As 2024

CHEM 116 Exam 3 Practice Test Qs&As 2024 Which of the following combinations cannot produce a buffer solution? - ANS-HNO3 and NaO3 Consider an indicator (kHIn= 6.3 x 10^-6) that ionizes as shown below. Which of the following statements is true? HIn + H20 (yellow) <----> H3O+ +In- (blue) - ANS-In acidic solutions containing the indicator, we would expect predominantly yellow color Which of the following solubility product expressions is correct? - ANS-AuI, ksp= [Au+][I-] In the titration curve shown below, which point represents the pH of a buffer solution? - ANS-II The plot on right shows a titration curve for the titration of 1.00 L of 1.00M diprotic acid H2A with NaOH. A buffer region is indicated by which point(s) a-d? - ANS-points a and c The following pictures represent so-lutions that contain a weak acid HA (pKa = 5.0) and its potassium salt KA. Unshaded spheres represent H atoms and shaded spheres represent A- ions. (K+, H3O+, OH-, and solvent H2O molecules have been omitted for clar-ity.) Which of these solutions are buffers? - ANS-All are buffer solutions The following pictures represent solutions at various points in the titration of a weak acid HA with aqueous KOH. Unshaded spheres represent H atoms, black spheres represent oxygen atoms, and shaded spheres represent A- ions. (K+, H3O+ initially present, OH- initially present and sol-vent water molecules have been omitted for clarity). Continues...