Fisher-Johns apparatus
Observing through the lens
Melting point apparatus
Experimental
record
Component
|
Melting range (℃)
|
Average (℃)
|
100% Benzoic acid
|
122.0~124.0
|
123.0
|
99% Benzoic acid +
1%
2-naphthol
|
118.0~120.0
|
119.0
|
80% Benzoic acid +
20%
2-naphthol
|
90.4~113.6
|
102.0
|
50% Benzoic acid +
50%
2-naphthol
|
90.2~106.5
|
98.4
|
20% Benzoic acid +
80%
2-naphthol
|
88.3~105.8
|
97.1
|
100% 2-naphthol
|
120.0~122.0
|
121.0
|
Data processing
Model
|
Polynomial
|
||
Adj. R-Square
|
0.91129
|
0.99865
|
0.98503
|
Value
|
Standard Error
|
||
Poly. fitting of
Max.
|
Intercept
|
122.42316
|
1.75243
|
Poly. fitting of
Max.
|
B1
|
-70.83259
|
42.35292
|
Poly. fitting of
Max.
|
B2
|
179.32579
|
205.90115
|
Poly. fitting of
Max.
|
B3
|
-294.68184
|
325.2792
|
Poly. fitting of
Max.
|
B4
|
185.78141
|
161.53845
|
Poly. fitting of
Min.
|
Intercept
|
121.58944
|
0.45627
|
Poly. fitting of
Min.
|
B1
|
-325.07157
|
11.02727
|
Poly. fitting of
Min.
|
B2
|
1139.85131
|
53.6097
|
Poly. fitting of
Min.
|
B3
|
-1644.22212
|
84.69171
|
Poly. fitting of
Min.
|
B4
|
827.85708
|
42.05916
|
Poly. of average
|
Intercept
|
122.00714
|
1.10342
|
Poly. of average
|
B1
|
-198.13952
|
26.66762
|
Poly. of average
|
B2
|
660.78879
|
129.64618
|
Poly. of average
|
B3
|
-970.95412
|
204.81286
|
Poly. of average
|
B4
|
507.30774
|
101.71309
|
Analysis
Poly. of average
|
F(x) = y = 122.00714-198.13952*x+660.78879*x^2
-970.95412*x^3+507.30774*x^4
|
First order derivative of F(x)
|
y’ = -198.13952+1321.57758*x
-2912.86236*x^2+2029.23096*x^3
|
Eutectic point (Benzoic acid / Total)
|
0.717
|
Eutectic temperature (℃)
|
95.8
|
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