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Determine the molar ratio of base to acid in a buffer solution of pH 9.5? (pKa for the weak acid = 9.10) Report your answer as whole numbers separated by a colon. DO NOT include units or any spaces. E.g. 1:2 Answer:

Which of the following occurs when molten NaCl is electrolysed in an electrolytic cell? BATTERY Cibubbles Mollen NOCI C Na In Bachoda Cathode Select one: O a. Sodium ions lose electrons at negative electrode O b. Oxidation occurs at -ve electrode and reduction at +ve electrode O c. Chlorine gas is produced at positive electrode O d. Electrons flow through liquid from -ve electrode to +ve electrode

A student wishes to make a buffer using CH3COOH and CH3COONa. Which of the following combination of solutions would yield the best buffering capacity? Select one: O a. 0.1M CH3COOH and 0.1M CH3COONa O b. 0.1M CH3COOH and 0.001M CH3COONa OC. 0.01M CH3COOH and 0.001M CH3COONa O d. 0.001M CH3COOH and 0.001M CH3COONa

Which of the following salts give basic aqueous solutions? (1) KNO3 (2) KCH3COO (3) NH4NO3 (5) (NH4)2SO4 Select one: O a. 2 & 4 O b. 1 only O C. O d. 1, 2, 4 & 5 3 & 5 (4) NaCN

The indicator methyl red changes from red to yellow over the pH range from 4.4 to 6.2. If the indicator is placed in a colourless buffer solution of pH = 4.21,what colour would you expect the solution to be? Select one: O a. white O b. yellow O c. orange O d. red

Use standard electrode potentials from the table below to answer this question. Cu²+ + 2e Cu (s) Fe2+ (aq) + 2e = Fe(s) Select one: True +0.34 V The reaction: Cu (s) + Fe²+ (aq) spontaneous as written. False -0.44V 11 Fe(s) + Cu²+ (aq) is