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AP® Chemistry

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Unknown Concentration

APCHEM-1KLLUW

A sample of green nickel solution is analyzed using a spectrophotometer (or colorimeter). A graph of absorbance vs. concentration of solution yielded the equation $y = 0.50x - 0.010$. An unknown concentration of this nickel solution produces an absorbance of 0.80.

Which of the following is the concentration?

A

0.39 M

B

0.58 M

C

0.80 M

D

1.62 M