Calculate the PH of a Buffer Solution Prepared by Dissolving

question 130

Multiple Choice

Calculate the pH of a buffer solution prepared by dissolving 0.2 mole of sodium cyanate (NaCNO) and 1.0 mole of cyanic acid (HCNO) in enough water to make 1.0 liter of solution. [K_a(HCNO) = 2.0 * 10^-4]

• A) 0
• B) 3.0
• C) 3.7
• D) 4.4
• E) 5.0

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Definitions:

Biological Magnification

The increased concentration of toxic chemicals, such as PCBs, heavy metals, and certain pesticides, in the tissues of organisms at higher trophic levels in food webs.

Bioconcentration

The accumulation of a substance in the tissues of living organisms at higher concentrations than in the surrounding environment.

Pesticide Treadmill

A situation where farmers must continuously use more and different chemicals to control pests that have developed resistance to pesticides.

Net Primary Productivity

The rate at which all the plants in an ecosystem produce net useful chemical energy; essentially, it is the amount of energy that is available to the primary consumers in an ecosystem.