Ch . 19 Acids and Bases Crossword - WordMint - Free Printable

To solve the crossword puzzle related to acids and bases, we need to match the clues with the appropriate terms. Here is the solution along with explanations for each clue:

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Across:

1. 2. a hydrogen acceptor
- Answer: Base
- Explanation: A base accepts hydrogen ions (H⁺) in a chemical reaction.

2. 3. contain 3 ionizable hydrogens
- Answer: Phosphoric acid
- Explanation: Phosphoric acid (H₃PO₄) has three ionizable hydrogen atoms.

3. 6. slightly ionize in aqueous solutions
- Answer: Weak acid
- Explanation: Weak acids partially dissociate in water, releasing only a small fraction of their hydrogen ions.

4. 9. changes colors with changes in pH
- Answer: Indicator
- Explanation: pH indicators change color based on the acidity or basicity of a solution.

5. 11. a basic solution
- Answer: Alkaline
- Explanation: A basic solution has a pH greater than 7.

6. 16. negative log of the hydrogen concentration
- Answer: pH
- Explanation: pH is defined as the negative logarithm of the hydrogen ion concentration (\[H⁺\]).

7. 17. formed when a base gains a H ion
- Answer: Conjugate acid
- Explanation: When a base accepts a proton (H⁺), it forms its conjugate acid.

8. 18. indicator changes color in a titration
- Answer: Phenolphthalein
- Explanation: Phenolphthalein is a common indicator used in titrations; it turns pink in basic solutions.

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Down:

1. 1. H₃O⁺
- Answer: Hydronium ion
- Explanation: The hydronium ion is the hydrated form of a hydrogen ion (H⁺).

2. 4. acid + base yields salt + water
- Answer: Neutralization
- Explanation: When an acid reacts with a base, they neutralize each other to form salt and water.

3. 5. hydrogen ion donor
- Answer: Acid
- Explanation: An acid donates hydrogen ions (H⁺) in a chemical reaction.

4. 7. Used to determine the unknown concentration of an acid or base
- Answer: Titration
- Explanation: Titration is a laboratory technique used to determine the concentration of an unknown acid or base by reacting it with a known concentration of a base or acid.

5. 8. completely ionized in aqueous solutions
- Answer: Strong acid
- Explanation: Strong acids fully dissociate in water, releasing all their hydrogen ions.

6. 10. yield hydrogen ions in aqueous solution
- Answer: Acidic
- Explanation: Acids release hydrogen ions (H⁺) when dissolved in water.

7. 12. pH from 0 to 7
- Answer: Acidic
- Explanation: Solutions with a pH between 0 and 7 are considered acidic.

8. 13. turn litmus red
- Answer: Acid
- Explanation: Litmus paper turns red in the presence of an acid.

9. 14. feel slippery and conduct electricity
- Answer: Basic
- Explanation: Basic solutions (pH > 7) often feel slippery and can conduct electricity due to the presence of hydroxide ions (OH⁻).

10. 15. pH greater than 7
- Answer: Basic
- Explanation: Solutions with a pH greater than 7 are considered basic.

11. 19. solution with a relatively constant pH
- Answer: Buffer
- Explanation: A buffer solution resists changes in pH upon the addition of small amounts of acid or base.

12. 20. turns litmus blue
- Answer: Base
- Explanation: Litmus paper turns blue in the presence of a base.

13. 21. acts as an acid or a base
- Answer: Amphiprotic
- Explanation: Amphiprotic substances can act as both acids (donate protons) and bases (accept protons).

14. 22. pH = 7
- Answer: Neutral
- Explanation: A solution with a pH of 7 is neutral.

15. 23. particle that remains when an acid donates a H ion
- Answer: Conjugate base
- Explanation: When an acid donates a proton (H⁺), the remaining particle is called the conjugate base.

16. 24. moles of hydrogen ions equal moles of hydroxide ions
- Answer: Neutral solution
- Explanation: In a neutral solution, the concentration of hydrogen ions (\[H⁺\]) equals the concentration of hydroxide ions (\[OH⁻\]).

17. 25. taste sour and conduct electricity
- Answer: Acidic
- Explanation: Acidic solutions taste sour and can conduct electricity due to the presence of hydrogen ions (H⁺).

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Final Answer:

The completed crossword puzzle would look like this (with answers filled in):

```
Across:
2. Base
3. Phosphoric acid
6. Weak acid
9. Indicator
11. Alkaline
16. pH
17. Conjugate acid
18. Phenolphthalein

Down:
1. Hydronium ion
4. Neutralization
5. Acid
7. Titration
8. Strong acid
10. Acidic
12. Acidic
13. Acid
14. Basic
15. Basic
19. Buffer
20. Base
21. Amphiprotic
22. Neutral
23. Conjugate base
24. Neutral solution
25. Acidic
```

Thus, the final answer is:
\boxed{\text{Completed Crossword Puzzle}}