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Eventually a situation of equilibrium was obtained, but any slight alteration of conditions could bring about a further exchange of the acid and basic parts of the salts in solution. He was elected to the Chamber of Deputies in, and but resigned on a matter of principle in He introduced the concept of permutation of the constituent part of salts équipollence: One of the flasks was then evacuated and the other filled with the gas under test. While in Rome, the young chemist was able to use the laboratory of Wilhelm von Humboldt, on which occasion he discovered the presence of fluorides and phosphates in the bones of fish. An obvious reaction for for comparison would be that between hydrochloric-acid gas and ammonia. He took two twelve-liter, double-neck flasks.

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For example, insoluble lead sulfate had been found by analysis to consist of lead,

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Gay-Lussac, Joseph Louis

His experimental work was rather poor and hurried. Gay-Lussac also analyzed the composition of substances isolated from animals and vegetables, measured the solubility of salts as a function of temperature, and developed volumetric methods for chemical analysis. In addition to his well-known work on the combining properties of gases, Gay-Lussac also worked on the determination of vapor densities, and the coefficients of expansion of gases, in which he pioneered the procedures, and contributed to the careful quantitative measurements that in later years were so useful for grounding the kinetic theory of gases and thermal physics. This was in fairly close agreement with the value obtained experimentally by L. In he published a law of the expansion of gases by heat, which became known as Charles' law. He stressed the analogy of the properties of iodine with those of chlorine. They applied their method in to the analysis of twenty vegetable and animal substances.

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