The following compounds are available as 0.10 M aqueous solutions. 
Which two solutions could be used to prepare a buffer with a pH of ~ 7?
Definitions:
Depreciation
The systematic allocation of the cost of a tangible asset over its useful life, reflecting the decrease in value due to wear and tear, aging, or obsolescence.
EAC Method
Equivalent Annual Cost Method, a decision-making tool used for evaluating the cost-effectiveness of projects with differing lifespans.
Mutually Exclusive
Situations or decisions that cannot occur simultaneously; choosing one option means the others cannot be chosen.
Projects
Specific tasks or programs undertaken to achieve goals within a timeframe, often involving research or design efforts.
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