A Chemist Is Tasked with Determining the Concentration of Nickel

question 19

Short Answer

A chemist is tasked with determining the concentration of nickel for a water sample drawn from a well next to a nickel mine.To analyze the sample using atomic absorbance spectroscopy (AAS),she prepares six samples (0-5)by adding 10.00 mL well water to a 50.00-mL volumetric flask,then adding an increasing volumes of 25.00-ppm nickel solution,diluting the resulting solution to 50.00 mL with 0.1 M HNO₃.Following AAS analysis,a graph of absorbance versus ppm nickel standard gave a best-fit line y = 0.0428x + 0.0487.Calculate the ppm nickel in the well water sample.

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Definitions:

Subtraction

A mathematical operation that represents the operation of removing objects from a collection.

Pendulum Clock

A clock that keeps time by using a swinging weight, or pendulum, as its timekeeping element.

Complete Cycle

A full sequence of events that returns to the starting point or condition, often referred to in contexts like oscillations or business cycles.

Two Decimal Places

A numerical representation precise to two digits to the right of the decimal point.