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TEAS 7 Science C2 Acids, Bases and Salts A solution with a pH of 5.0 _____.......

A solution with a pH of 5.0 _____.

A. has a hydrogen-ion concentration of 5.0M

B. is neutral

C. has a hydroxide-ion concentration of 1 x 10 –9 M

D. None of the above

Answer Explanation:

a. is basic: Incorrect. Solutions with pH values less than 7 are acidic, not basic. A pH of 5.0 indicates an acidic solution.

b. has a hydrogen-ion concentration of 5.0M: Incorrect. The pH value does not directly provide information about the concentration of hydrogen ions. pH is a logarithmic scale that measures the concentration of hydrogen ions in a solution.

c. is neutral: Incorrect. Solutions with a pH of 7 are considered neutral. A pH of 5.0 indicates an acidic solution.

d. has a hydroxide-ion concentration of 1 x 10 –9 M: Incorrect. This statement relates to the calculation of hydroxide-ion concentration in a neutral solution using the Kw value (the ion product of water). It does not directly pertain to the pH value of the solution.

Therefore, the Correct Answer is D.

More Questions on TEAS 7 Science

  • Q #1: What is produced when an acid reacts with ammonia?

    A. Water

    B. Ammonia and Water

    C. Ammonium salt

    D. Hydrogen gas

    Answer Explanation

    A) Water: Water is not typically produced when an acid reacts with ammonia. Water may be present in the reaction mixture, but it is not a direct product of the reaction between the acid and ammonia.

    B) Ammonium chloride: Water and ammonia  are not typically produced when an acid reacts with ammonia. 

    C) Ammonium salt (Correct Answer): When an acid reacts with ammonia, an ammonium salt is typically formed. The specific ammonium salt produced depends on the acid used in the reaction.

    D) Hydrogen gas: Hydrogen gas is not typically produced when an acid reacts with ammonia. The reaction between an acid and ammonia does not involve the liberation of hydrogen gas.

  • 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: What is the Brønsted-Lowry definition of an acid and base?

    A. Acids are electron donors and bases are electron acceptors.

    B. Acids are proton donors and bases are proton acceptors.

    C. Acids are proton acceptors and bases are proton donors.

    D. Acids are compounds that increase the concentration of hydroxide ions in solution and bases are compounds that increase the concentration of hydrogen ions in solution.

    Answer Explanation

    A) Acids are electron donors and bases are electron acceptors: This statement describes the Lewis definition of acids and bases, which focuses on the transfer of electron pairs, rather than the Brønsted-Lowry definition, which involves the transfer of protons.

    B) Acids are proton donors and bases are proton acceptors. (Correct Answer): According to the Brønsted-Lowry definition, an acid is a substance that donates a proton (H+ ion), while a base is a substance that accepts a proton.

    C) Acids are proton acceptors and bases are proton donors: This statement incorrectly describes the roles of acids and bases according to the Brønsted-Lowry definition. Acids donate protons, while bases accept protons.

    D) Acids are compounds that increase the concentration of hydroxide ions in solution and bases are compounds that increase the concentration of hydrogen ions in solution: This statement does not accurately represent the Brønsted-Lowry definition. Acids and bases are defined based on their behavior regarding proton transfer, not changes in ion concentration.

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