What ions make ammonia solution alkaline?

A. Cl- ions

B. H+ ions

C. Na+ ions

D. OH- ions

Answer Explanation:

A) Cl- ions: Chloride ions (Cl-) are typically found in salts and do not contribute directly to the alkalinity of ammonia solution.

B) H+ ions: Hydrogen ions (H+) typically characterize acidic solutions, not alkaline solutions. Ammonia solution doesn't contain H+ ions.

C) Na+ ions: Sodium ions (Na+) are typically found in salts and do not contribute directly to the alkalinity of ammonia solution.

D) OH- ions (Correct Answer): Ammonia solution becomes alkaline due to the presence of hydroxide ions (OH-). Ammonia (NH3) reacts with water to form ammonium ions (NH4+) and hydroxide ions (OH-), increasing the concentration of OH- ions and making the solution alkaline.

Therefore, the Correct Answer is D.

Q #1: Which statement regarding metal and non-metal oxides is not true?

A. Metal oxides are bases and forms alkalis in water.

B. Non-metal oxides form acids in water.

C. Solutions of non-metal oxides change red litmus blue.

D. Metal oxides color universal indicator blue and non-metal oxides color it red.

Answer Explanation

A. Metal oxides are bases and form alkalis in water: This statement is generally true. Metal oxides typically react with water to form basic solutions (alkalis). Therefore, this statement is true.

B. Non-metal oxides form acids in water: This statement is generally true. Non-metal oxides typically react with water to form acidic solutions. Therefore, this statement is true.

C. Solutions of non-metal oxides change red litmus blue: This statement is not true. Non-metal oxides typically form acidic solutions in water, which would not change red litmus paper to blue. Instead, they would typically turn blue litmus paper red.

D. Metal oxides color universal indicator blue and non-metal oxides color it red: This statement is generally true. Metal oxides tend to produce basic solutions, which turn universal indicator blue. Non-metal oxides tend to produce acidic solutions, which turn universal indicator red. Therefore, this statement is true.
Q #2: What ions make ethanoic acid acidic?

A. H+ ions

B. OH- ions

C. Na+ ions

D. Cl- ions

Answer Explanation

A) H+ ions (Correct Answer): Ethanoic acid (acetic acid) is acidic because it donates protons (H+) in solution, leading to the formation of hydronium ions (H3O+). This process characterizes acids.

B) OH- ions: Hydroxide ions (OH-) typically characterize bases, not acids. Ethanoic acid doesn't contain hydroxide ions.

C) Na+ ions: Sodium ions (Na+) are not responsible for the acidity of ethanoic acid. Na+ ions are typically found in salts and do not contribute to acidity.

D) Cl- ions: Chloride ions (Cl-) are not responsible for the acidity of ethanoic acid. Cl- ions are typically found in salts and do not contribute to acidity.
Q #3: Why is ethanoic acid a weak acid?

A. Because it reacts slowly with bases

B. Because it forms a basic solution when dissolved in water

C. Because it only partially dissociates in solution

D. Because it has a low pH value

Answer Explanation

Rationale for each choice:

A) Because it reacts slowly with bases: The rate of reaction with bases does not determine whether an acid is weak or strong. Ethanoic acid's reaction rate with bases is not a primary factor in its classification as a weak acid.

B) Because it forms a basic solution when dissolved in water: This statement is incorrect. Ethanoic acid is an acid and forms acidic solutions when dissolved in water.

C) Because it only partially dissociates in solution (Correct Answer): Ethanoic acid is considered a weak acid because it only partially dissociates into hydrogen ions (H+) and acetate ions (CH3COO-) in solution. This partial dissociation results in a lower concentration of hydrogen ions compared to strong acids.

D) Because it has a low pH value: While weak acids generally have higher pH values compared to strong acids, the pH value alone does not determine whether an acid is weak or strong. Ethanoic acid's weak acidity is primarily attributed to its partial dissociation in solution, rather than its pH value.

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What ions make ammonia solution alkaline?

More Questions on TEAS 7 Science

Q #1: Which statement regarding metal and non-metal oxides is not true?

Answer Explanation

Q #2: What ions make ethanoic acid acidic?

Answer Explanation

Q #3: Why is ethanoic acid a weak acid?

Answer Explanation

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