The following atomic absorption (AA) data was obtained for a series of Na⁺ standards. Plot the data points for the average absorbance with conc. Na⁺ on the x axis and the instrument reading on the y axis. Include vertical error bars representing the standard deviation of the absorbance readings. The calibration curve that you obtain is slightly curved! One way to handle a curved calibration line is to fit the data to a power series. A cubic equation (y = a + bx + cx² + dx³) is usually sufficient to fit this type of case. Check the equation of the trendline and determine the coefficients. Using an appropriate equation, find the concentration of Na⁺ in an unknown sample if the AA reading is (a) 180 or (b) 135.

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(20 pts) The following atomic absorption (AA) data was obtained for a series of Na+ standards. Plot the data points for the average absorbance with conc. Na+on the x axis and the instrument reading on the y axis. Include vertical error bars representing the standard deviation of the absorbance readings. The calibration curve that you obtain is slightly curved! One way to handle a curved calibration line is to fit the data to a power series. A cubic equation (y=a+bx+cx2+dx3) is usually sufficient to fit this type of case. Check the equation of the trendline and determine the coefficients. Using an appropriate equation, find the concentration of Na+in an unknown sample if the AA reading is (a) 180 or (b) 135