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18,014 solutions

Weak Bases

Q. Nicotine, C10H14N2, is a weak base and has a Kb of 1.0 x 10-6. What is the pH of a 0.20 M solution of nicotine? For full credit, write out the reaction (C10H14N2 (aq) + H2O(l)  …), write out the I.C.E. table beneath it, write the equilibrium constant expression in terms of x, and solve, checking any assumptions (Since it is a basic solution, your pH should be >7).

Solved • Mar 31, 2020

Cell Potential

Q. A voltaic cell that uses the reaction Tl^3+(aq) + 2Cr^2+(aq) → Tl^+ (aq) + 2 Cr^3+(aq) has measured standard cell potential of + 1.19 V. Write the two half-cell reactions. Express your answer as a chemical equation. Identify all the phases in your answer.

Solved • Mar 5, 2020

Galvanic Cell

Q. Consider a chromium-silver voltaic cell that is constructed such that one half-cell consists of the chromium, Cr, electrode immersed in a Cr(NO3)3 solution, and the other half-cell consists of the silver, Ag, electrode immersed in a AgNO3 solution. The two electrodes are connected by a copper wire. The Cr electrode acts as the anode, and the Ag electrode acts as the cathode. To maintain electric neutrality, you add a KNO3 salt bridge separating the two half-cells. Use this information to solve Parts B, C, and D. The half-cells is a chamber in the voltaic cell where one half-cell is the site of the oxidation reaction and the other half-cell is the site of the reduction reaction. Type the half-cell reaction that takes place at the anode for the chromium-silver voltaic cell. Indicate the physical states of atoms and ions using the abbreviation (s), l), or (g) for solid, liquid, or gas, respectively. Use (aq) for an aqueous solution. Do not include phases for electrons. Express your answer as a chemical equation.

Solved • Mar 4, 2020

Galvanic Cell

Q. Consider a chromium-silver voltaic cell that is constructed such that one half-cell consists of the chromium, Cr, electrode immersed in a Cr(NO3)3 solution, and the other half-cell consists of the silver, Ag, electrode immersed in a AgNO3 solution. The two electrodes are connected by a copper wire. The Cr electrode acts as the anode, and the Ag electrode acts as the cathode. To maintain electric neutrality, you add a KNO3 salt bridge separating the two half-cells. Use this information to solve Parts B, C, and D. The half-cells is a chamber in the voltaic cell where one half-cell is the site of the oxidation reaction and the other half-cell is the site of the reduction reaction. Type the half-cell reaction that takes place at the cathode for the chromium-silver voltaic cell. Indicate the physical states of atoms and ions using the abbreviation (s), l), or (g) for solid, liquid, or gas, respectively. Use (aq) for an aqueous solution. Do not include phases for electrons. Express your answer as a chemical equation.

Solved • Mar 4, 2020

Cell Potential

Q. Mercuric oxide dry-cell batteries are often used where a high-energy density is required, such as in watches and cameras. The two half-cell reactions that occur in the battery are HgO(s) + H2O(l) + 2e^- → Hg(l) + 2OH^-(aq) Zn(s) + 2OH^-(aq) → ZnO(s) + H2O(l) + 2e^-. Write the overall cell reaction. Express your answer as a chemical equation. Identify all of the phases in your answer.

Solved • Mar 5, 2020

Ksp

Q. The solubility of silver(I) phosphate at a given temperature is 1.26 g/L. Calculate the Ksp at this temperature. After you get your answer, take the negative log and enter that (so it's like you're taking the pKsp) (Note: silver (I) phosphate molar mass = 419 g/mol)

Solved • Mar 31, 2020

Identifying Acids and Bases

Q. In each of the following, the stronger acid is identified, and an explanation is given. All except one are correct statements. Which one is not correct?

Solved • Mar 31, 2020