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The graph shows a calibration using pH 7 and pH 10
buffers. The calibration equation is the straight line con-
necting the two points. If temperature changes, the slope
changes by the ratio (t
2
+ 273.15)/(t
1
+ 273.15), where t
1
is the calibration temperature and t
2
is the process tem-
perature in Y!. The calibration equations rotate about the
point (pH 7, A).
H
H
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