Karl Friedrich Mohr Invented Pinchcock, Cork borer, Mohr’s balance, Mohr’s salt

Karl Friedrich Mohr – inventor of Mohr's clip

Karl Friedrich Mohr

Biography & contributions

Karl Friedrich Mohr was a German chemist born on November 04, 1806 – died on September 28, 1879. He was invented such laboratory apparatus such as Pinchcock, Cork borer, Mohr’s balance, Mohr’s salt (Ammonium iron (II) sulfate) and Mohr’s clip.

Mohr stated the principle of conservation of energy and also he improved analytical methods.

Conservation energy

The law of conservation of energy, first formulated in the nineteenth century, is a law of physics. It states that the total amount of energy in an isolated system remains constant over time.

Mohr’s statement towards conservation energy is

“Besides the 54 known chemical elements there is in the physical world one agent only, and this is called Kraft [energy or work]. It may appear, according to circumstances, as motion, chemical affinity, cohesion, electricity, light, and magnetism; and from any one of these forms it can be transformed into any of the others."

Ammonium iron(II) sulfate / Mohr's Salt

Mohr's Salt chemical name is Ammonium iron (II) sulfate. It is the inorganic compound and classified as a double salt of ferrous sulfate and ammonium sulfate. Mohr's Salt is a common laboratory reagent. It is preferred over other salts of ferrous sulfate for titration purposes as it is much less prone to oxidation by air to iron(III). The ammonium ions make solutions of Mohr's salt slightly acidic, which slows this oxidation process. Mohr's salt is prepared by dissolving an equimolar mixture of hydrated ferrous sulfate and ammonium sulfate in water containing a little sulfuric acid, and then subjecting the resulting solution to crystallization.

Mohr’s clip

Mohr was the leading scientific chemist of his time in Germany, and the inventor of many improvements in analytical methodology. He invented an improved burette which had a tip at the bottom and a clamp (a 'Mohr's clip'). He took one of his own pipettes, he added a short length of rubber tubing at the bottom pinched by a brass clip of his own design. Squeezing the clip, the reagent could be delivered continuously or dropwise, while the scale could be read at a glance.

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