1. Describe the test for ammonia gas

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2. When preparing hydrated copper(II) sulfate crystals starting from copper(II) oxide, why is an excess of copper (II) oxide added?

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3. What is defined as a proton donor?

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4. Describe the method to prepare a pure dry sample of copper sulfate (soluble salt)

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5. A pure, dry sample of a soluble salt can be prepared starting from an acid and alkali. What are the two stages of this method called?

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6. Is sodium hydroxide soluble?

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7. When testing a sample for ions, hydrochloric acid and then barium chloride are added to a sample. A white precipitate forms. What is the name of that precipitate?

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8. What is the universal indicator colour of a pH 0-3 solution?

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9. If sulfuric acid (H₂SO₄) produces 2H⁺, what must the other ion be?

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10. What method would be followed to prepare a sample of pure, dry lead (II) sulfate?

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11. acid + base →

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12. Is ammonia acidic or basic?

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13. An alkali is called a proton _________

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14. What is the pH of a weak alkali?

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15. What is the empirical formula of a compound in which 0.48 g of carbon combines with 0.08 g of hydrogen and 0.64 g of oxygen?

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16. When NaOH is added to a sample, a brown precipitate forms. What cation was present in the sample?

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17. In a flame test, why is hydrochloric acid used?

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18. Can a base neutralise an acid?

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19. How are sodium ions identified, and what is the result?

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20. What is an acid?

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21. Describe an experiment to prepare a pure, dry sample of an insoluble salt, starting from two soluble reactants

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