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Solutions with a constant volume of 10.0 mL contain 0.750mg of dissolved tooth enamel plus variable...

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Chemistry

Solutions with a constant volume of 10.0 mL contain 0.750mg ofdissolved tooth enamel plus variable concentrations of addedSr.

Added Sr(ng/mL=ppb) Signal(arbitrary units)
Added Sr: 0 , 2.50, 5.00, 7.50, 10.00

Signal: 28.0, 34.3, 42.8, 51.5, 58.6

a.) Find concentration of Sr and its uncertainty in the 10.0mLsolution in ppb.
b.) Find concentration of Sr in tooth enamel in ppm.
c.) If the standard addition intercept is the major source ofuncertainty, find the uncertainty in the concentration of Sr intooth enamel in ppm.
d.) Find the 95% confidence interval for Sr in tooth enamel

I figured out a: 8.72 +/- 0.43 ppb, I just don't understand therest

Answer & Explanation Solved by verified expert
3.9 Ratings (742 Votes)
The graph with the given data is a Solve the equation from the graph of the least squares linefor y 0 to get x interceptX 2736 3136 872    See Answer
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