124​ ML of 0

question 89

Multiple Choice

12.4​ mL of 0.25 M HCl is added to a 120.0-mL sample of 0.220 M HNO₂ (K_a for HNO₂ = 4.0 × 10^-4) . What is the equilibrium concentration of NO₂- ions?

• A) ​3.4 × 10^-3 M
• B) ​2.3 × 10-2 M
• C) ​3.9 × 10^-3 M
• D) ​4.7 × 10^-4 M
• E) ​9.4 × 10^-3 M

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Definitions:

Steep Mountain Front

A steep mountain front is a pronounced topographical feature where the slope of a mountain is dramatically steeper, often marking the boundary between differing geological formations.

River

A large, natural stream of water flowing in a channel to the sea, a lake, or another such stream.

Sand Dune

A hill or a ridge made of sand that has been shaped by the wind.

Deep Water

Water located in deep areas of oceans or lakes, typically characterized by cold temperatures and high pressures.