Degree Thörner

The Thörner degree ( unit symbol  ° Th , after the German chemist Wilhelm Thörner ) is a common dimensionless unit of measurement in Sweden and the successor states of the Soviet Union for determining the acidity of milk , similar to the Soxhlet-Henkel number  (° SH).

The Thörner grade is defined as the volume of 0.1 molar sodium hydroxide solution that is required to change the color of the phenolphthalein pH indicator to pink (= basic ) in a 100 ml sample diluted with two parts of distilled water to reach:

${\displaystyle {\text{°Th}}={\frac {V_{\text{NaOH 1/10-molar}}}{\text{100 ml Milch}}}={\frac {10}{4}}\cdot {\text{°SH}}={\frac {10}{9}}\cdot {\text{°D}}}$

Normal milk has an acidity of approx. 17 ° Th.

See also

• Degree Dornic  (° D)

Web links

• Russ Rowlett and the University of North Carolina at Chapel Hill ( Memento from May 21, 2015 in the Internet Archive )

Individual evidence

1. ↑ ( Page no longer available , search in web archives: Titratable acidity ).
2. ↑ Joachim Brock: Metabolism (protein metabolism, carbohydrate metabolism, fat metabolism, mineral metabolism), biochemistry of body fluids, nutrition, skin, immunobiology, statistics . Springer Verlag, Berlin, Heidelberg 1939, ISBN 978-3-662-23048-0 , pp. 181 ( limited preview in Google Book search).