Calculate the Minimum Concentration of Mg²⁺ That Must Be Added

question 79

Multiple Choice

Calculate the minimum concentration of Mg²⁺ that must be added to 0.10 M NaF in order to initiate a precipitate of magnesium fluoride. [K_sp(MgF₂) = 6.9 × 10^-9]

• A) 1.4 × 10^{7 M}
• B) 6.9 × 10^{-9 M}
• C) 6.9 × 10^{-8 M}
• D) 1.7 × 10^{-7 M}
• E) 6.9 × 10^{-7 M}

Recognize the relationship between specific behaviors (e.g., smoking, diet, physical activity) and cancer risk.

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Definitions:

Preset Value

A preset value is an established parameter or threshold within a system, device, or application that triggers a specific action or response when reached.

Sequencer Instruction

A programming command used in PLCs to execute a series of stored steps or operations in a sequential manner.

Output Word

A data structure or unit in digital electronics and computing used to represent output values or states.

Sequencer Program

A computer program designed to manage the execution order of other programs or instructions in a sequence.