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Which type of solution is one with a pH of 8?:

A. Acidic

B. Basic

C. Neutral

D. Pure

Answer Explanation:

a. Acidic: Solutions with pH values below 7 are considered acidic. A pH of 8 indicates a solution that is more basic than acidic.

b. Basic (Correct Answer): Solutions with pH values above 7 are considered basic or alkaline. A pH of 8 indicates a basic solution.

c. Neutral: Solutions with a pH of 7 are considered neutral. A pH of 8 indicates a solution that is slightly basic, not neutral.

Therefore, the Correct Answer is B.

More Questions on TEAS 7 Science

  • Q #1: What do bases react with?

    A. Acids to produce salts and water

    B. Salts to produce acids and water

    C. Water to produce acids and salts

    D. Neither acids, salts, nor water

    Answer Explanation

    A) Acids to produce salts and water (Correct Answer): Bases react with acids to form salts and water. This reaction is a common characteristic of bases, where they accept protons (H+) from acids to form water and salts.

    B) Salts to produce acids and water: Bases typically do not react with salts to produce acids and water. The reaction between a base and a salt is not a common reaction in chemistry.

    C) Water to produce acids and salts: Bases do not react with water to produce acids and salts. Bases can ionize in water to produce hydroxide ions (OH-) but do not typically react with water to produce acids and salts.

    D) Neither acids, salts, nor water: Bases do react with acids to form salts and water, making choice D incorrect. Bases do not react with salts or water to produce acids, salts, or water.

  • Q #2: What is an appropriate pH value for hydrochloric acid?

    A. pH 2-4

    B. pH 1-3

    C. pH 0-2

    D. pH 3-5

    Answer Explanation

    Rationale for each choice:

    A) pH 2-4: While hydrochloric acid is indeed highly acidic, a pH range of 2-4 would suggest a slightly less concentrated solution. However, this range might still be appropriate for dilute or partially neutralized hydrochloric acid.

    A) pH 1-3 (Correct Answer): Hydrochloric acid typically has a very low pH due to its strong acidic nature. A pH range of 1-3 is commonly observed for concentrated hydrochloric acid solutions.

    C) pH 0-2: This range suggests an even stronger acidity, which could be true for very concentrated hydrochloric acid solutions, although they might not commonly occur in typical laboratory or industrial settings.

    D) pH 3-5: This pH range would indicate a significantly less acidic solution compared to hydrochloric acid. Such a pH range might be more appropriate for weak acids or diluted hydrochloric acid solutions rather than the concentrated form.

  • Q #3: Why is NaCl neutral?

    A. Because it contains both hydrogen and hydroxide ions in equal amounts

    B. Because it contains hydrogen ions (H+) and hydroxide ions (OH-) in equal amounts

    C. Because it does not contain any hydrogen or hydroxide ions

    D. Because it dissociates completely in water

    Answer Explanation

    Rationale for each choice:

    A) Because it contains both hydrogen and hydroxide ions in equal amounts: This statement is incorrect. NaCl (sodium chloride) does not contain hydrogen or hydroxide ions. It dissociates into sodium ions (Na+) and chloride ions (Cl-) in water, not hydrogen or hydroxide ions.

    B) Because it contains hydrogen ions (H+) and hydroxide ions (OH-) in equal amounts: This statement is incorrect. NaCl does not contain hydrogen or hydroxide ions. In aqueous solution, NaCl dissociates into sodium ions and chloride ions, not hydrogen or hydroxide ions.

    C) Because it does not contain any hydrogen or hydroxide ions (Correct Answer): NaCl is a neutral compound composed of sodium ions (Na+) and chloride ions (Cl-). It does not contain any hydrogen or hydroxide ions, so it is neutral in aqueous solution.

    D) Because it dissociates completely in water: NaCl does dissociate in water, but its dissociation does not involve the generation of hydrogen or hydroxide ions. It dissociates into sodium ions and chloride ions, which do not contribute to the pH of the solution. Therefore, the completeness of dissociation does not determine its neutrality.