A Buffer Was Prepared by Adding 2

question 92

Multiple Choice

A buffer was prepared by adding 2.4 g of ammonium nitrate to 100.0 mL of 0.30 M ammonia (Kb = 1.8 × 10^-5) . To this solution was then added 10.0 mL of 0.30 M sodium hydroxide, which caused a pH change of ________.

• A) 3.0 pH units
• B) 0.30 pH units
• C) 0.90 pH units
• D) 0.09 pH units
• E) zero

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Definitions:

Telophase

The final phase of cell division, during which the chromosomes de-condense, nuclear envelopes re-form around the divided chromosomes, completing cytokinesis.

Chromatin Condenses

The process where chromatin fibers coil and fold to form more compact structures, typically during cell division.

Prophase

The first stage of cell division in both mitosis and meiosis, during which the chromatin condenses into visible chromosomes, and the nuclear envelope begins to disintegrate.

Phosphorylation

Phosphorylation is a biochemical process that involves the addition of a phosphate group to a molecule, crucial for energy transfer and signal transduction in cells.