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Early life and education

Haber was born in Breslau, Kingdom of Prussia (now Wrocław, Poland), into a well-off Jewish family. Despite Haber being a common family name in Breslau, the family has been traced back to a great-grandfather, Pinkus Selig Haber, who was a wool dealer from Kempen (now Kępno, Poland). An important Prussian edict of 13 March 1812 determined that Jews and their families, including Pinkus Haber, were "to be treated as local citizens and citizens of Prussia". Under such regulations, members of the Haber family were able to establish themselves in respected positions in business, politics, and law.

Haber was the son of Siegfried and Paula Haber, who were first cousins who married in spite of considerable opposition from their families. Haber's father Siegfried was a well-known merchant in the town, who had founded his own business in dye pigments, paints and pharmaceuticals. Paula experienced a difficult pregnancy and died three weeks after Fritz's birth, leaving Siegfried devastated and Fritz in the care of various aunts. When Haber was about six years old, Siegfried remarried to Hedwig Hamburger. Siegfried and his second wife had three daughters: Else, Helene, and Frieda. Although his relationship with his father was distant and often difficult owing to Fritz being associated with the death of his first wife, Haber developed close relationships with his stepmother and his half-sisters. Siegfried displayed love and care for his three daughters but never fully accepted Fritz as his son.

By the time Fritz was born, the Habers had to some extent become assimilated into German society. He attended primary school at the Johanneum School, a "simultaneous school" open equally to Catholic, Protestant, and Jewish students. At age 11, he went to school at the St Elizabeth classical school, in a class evenly divided between Protestant and Jewish students. His family supported the Jewish community and continued to observe many Jewish traditions, but were not strongly associated with the synagogue. Haber identified strongly as German, less so as Jewish.

Haber successfully passed his examinations at the St Elizabeth High School in Breslau in September 1886. Although his father wished him to become an apprentice in the dye company, Haber obtained his father's permission to study chemistry at the Friedrich Wilhelm University in Berlin (today the Humboldt University of Berlin), with the director of the Institute for Chemistry A. W. Hofmann. Haber was disappointed by his initial winter semester (1886–87) in Berlin, and arranged to attend the Heidelberg University for the summer semester of 1887, where he studied under Robert Bunsen. He then returned to Berlin, to the Technische Hochschule in Charlottenburg (today Technische Universität Berlin).

In the summer of 1889, Haber was conscripted and left university to perform his one-year volunteer service in the Sixth Field Artillery Regiment. Upon its completion, he returned to Charlottenburg where he became a student of Carl Liebermann. In addition to Liebermann's lectures on organic chemistry, Haber also attended lectures by Otto Witt on the chemical technology of dyes.

Liebermann assigned Haber to work on reactions with piperonal for his thesis topic, published as Ueber einige Derivate des Piperonals (About a Few piperonal Derivatives) in 1891. Haber received his doctorate cum laude from Friedrich Wilhelm University in May 1891, after presenting his work to a board of examiners from the University of Berlin, since Charlottenburg was not yet accredited to grant doctorates.

With his degree, Haber returned to Breslau to work at his father's chemical business, where their relationship continued to have difficulties. Through Siegfried's connections, Haber was assigned a series of practical apprenticeships in different chemical companies to gain experience. These included Grünwald and Company (a Budapest distillery), an Austrian ammonia-sodium factory, and the Feldmühle paper and cellulose works. These experiences drove Haber to learn more about technical processes, and persuaded his father to let him spend a semester at the Polytechnic College in Zürich (now the ETH Zürich), studying with Georg Lunge. In the Fall of 1892, Haber returned again to Breslau to work in his father's company, but the two men continued to clash and Siegfried finally accepted that they could not work well together.

Haber had received a PhD in chemistry by this time, but his father required him to take handwriting courses and become a salesman to learn more about the company. Haber urged his father to transfer from natural to synthetic dyes, but his father refused. Eventually, his father followed global business trends and switched to synthetic dyes. Haber's next suggestion was for his father to purchase calcium hypochlorite which at the time was the only known treatment of cholera. The current cholera epidemic ended up being isolated and thus resulted in their possession of a sizeable amount of unused calcium hypochlorite, which is unstable. This caused a rift between Siegfried and Haber, with his father telling him to go back to his university studies as he did not belong in the business world.