Question

A) Aluminum is one of the most abundant metals in Earth's crust. The aluminum compound found in bauxite ore is Al2O3. Over one hundred years ago, it was difficult and expensive to isolate aluminum from bauxite ore. In 1886, a brother and sister team, Charles and Julia Hall, found that molten (melted) cryolite, Na3AlF6, would dissolve bauxite ore. Electrolysis of the resulting mixture caused the aluminum ions in the Al2O3 to be reduced to molten aluminum metal. This less expensive process is known as the Hall process. Write the oxidation state for each of the elements in cryolite. B) Sodium hydroxide is added to a solution with a pH of two and thymol blue indicator. Describe the color of the solution at the following pH values: 4, 7, 10, and 13. C) A 4.0 M solution of Mg(OH)2 is completely neutralized by 160 mL of a 1.0 M solution of HCl. How many milliliters of magnesium hydroxide were required?

          A) Aluminum is one of the most abundant metals in Earth's crust. The aluminum compound found in bauxite ore is Al2O3. Over one hundred years ago, it was difficult and expensive to isolate aluminum from bauxite ore. In 1886, a brother and sister team, Charles and Julia Hall, found that molten (melted) cryolite, Na3AlF6, would dissolve bauxite ore. Electrolysis of the resulting mixture caused the aluminum ions in the Al2O3 to be reduced to molten aluminum metal. This less expensive process is known as the Hall process. Write the oxidation state for each of the elements in cryolite.
B) Sodium hydroxide is added to a solution with a pH of two and thymol blue indicator. Describe the color of the solution at the following pH values: 4, 7, 10, and 13.
C) A 4.0 M solution of Mg(OH)2 is completely neutralized by 160 mL of a 1.0 M solution of HCl. How many milliliters of magnesium hydroxide were required?

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