(a)
Interpretation:
Using spreadsheet and using the method of least squares the slope, intercept and their uncertainties has to be found out and also a calibration curve has to be constructed.
Concept Introduction:
Linear Calibration Curve:
The equation of linear calibration line is:
Where,
Standard deviation of y:
The standard deviation of y is:
Standard uncertainty of slope and intercept:
The standard uncertainty of slope is:
The standard uncertainty of intercept is:
(b)
Interpretation:
Using spreadsheet the average corrected signal for the unknown with given replicate measurements has to be found out.
Concept Introduction:
Linear Calibration Curve:
The equation of linear calibration line is:
Where,
To Find: The average corrected signal for the unknown using spreadsheet.
(c)
Interpretation:
The concentration of the unknown with its standard uncertainty
Concept Introduction:
Uncertainty with a Calibration Curve:
Propagation for the equation
The standard uncertainty in x is given as:
Where,
k is the number of replicate measurements
To Find: The concentration of the unknown with its standard uncertainty
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Quantitative Chemical Analysis
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