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Introduction :
Solutions are homogeneous mixtures formed when a solute is dissolved in a solvent. There are two components in a solution- solvent and solute. The solvent is a substance in which another substance is dissolved. A solute is a substance that is dissolved in the solvent.
Answer to Problem 32A
Correct answer :
The correct answer is option (A) a base.
Explanation of Solution
Explanation/justification for the correct answer :
Option (A) a base. The substances that release hydroxide ions (OH-) when dissolved in water are called bases. The more hydroxide ions a substance releases, the more basic is the solution. Sodium Hydroxide (NaOH) is a common base that breaks up in water to release sodium ions (Na+) and hydroxide ions (OH-). So, the correct answer is option (A).
Explanation for incorrect answer :
Option (B) an acid. When a substance that contains hydrogen is dissolved in water, it may release a hydrogen ion (H+) because it is attached to the negatively charged oxygen atoms in water. Substances that release hydrogen ions when dissolved in water are called acids. The more hydrogen ions a substance releases, the more acidic is the solution. So, this is an incorrect option.
Option (C) a buffer. pH is the measure of concentration of hydrogen ions (H+) in a solution. Buffers are mixtures that react with acids and bases to keep the pH within a specific range. In cells, buffers keep the pH at 6.5-7.5. So, this is an incorrect answer.
Option (D) salt. A salt is an ionic compound formed by the reaction of an acid with a base. A salt consists of the positive ion (cation) of a base and the negative ion (anion) of an acid. Hence, this is an incorrect answer.
Chapter 6 Solutions
Glencoe Biology (Glencoe Science)
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