A Weak Acid Has K_a = 4

question 88

Multiple Choice

A weak acid has K_a = 4.2 × 10^-3.If [A^-] = 2.0 M,what must [HA] be so that [H⁺] = 2.1 × 10^-3 M?

• A)1.5 M
• B)2.0 M
• C)1.0 M
• D)0.5 M
• E)0.25 M

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Definitions:

Net Present Value

Net Present Value (NPV) is a financial metric that calculates the difference between the present value of cash inflows and the present value of cash outflows over a period of time.

Present Value

The current value of a sum of money or cash flows expected in the future, discounted at a given return rate.

Initial Cost

The upfront expenditure associated with the acquisition of an asset or the launch of a project.

Net Present Value

A valuation method used to estimate the attractiveness of an investment, by calculating the present value of expected future cash flows minus the initial investment cost.