反叛者
发表于 2025-3-23 13:27:30
M.C. Escher e il piano iperbolicochange in pH. This resistance to change in the free hydrogen ion concentration of a solution was described by Fernbach and Hubert (1900) as ‘buffering’. In studies of the enzyme, amylase, they found that a partly neutralized solution of phosphoric acid acted as a ‘protection against abrupt changes i
Confirm
发表于 2025-3-23 17:05:08
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方舟
发表于 2025-3-23 21:47:47
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Benzodiazepines
发表于 2025-3-24 00:46:52
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大看台
发表于 2025-3-24 02:46:50
Quando il cielo ci cade sulla testaith the nature of the solvent. The lower alcohols resemble water, in that they can form the ions ROH. and RO. , but their dissociation is less than for water ((p.=16.7, P.=19.1, cf. p.= 14.0). Consequently, substances dissolved in alcohols are weaker acids and bases than in water. Other factors infl
GROWL
发表于 2025-3-24 09:13:04
Quando il cielo ci cade sulla testa0.M are difficult to maintain in the presence of adventitious complexing agents, hydrolytic equilibria, adsorption and, possibly, contamination. Many problems can be overcome by the use of metal-ion buffers which provide a controlled source of free metal ions in a manner similar to the regulation of
transplantation
发表于 2025-3-24 12:19:43
: un’occasione per parlare di numeri primiistilled or de-ionized water. The drying procedure is important because many substances are hygroscopic. When substances are known to deteriorate on storage, when there is evidence of decomposition, or when known impurity levels in reagents are unacceptable, further purification is required. Where p
harrow
发表于 2025-3-24 16:26:10
: un film e un invito alla topologia dried to constant composition. The distilled water used as solvent should have been recently boiled to remove dissolved carbon dioxide and have been protected from contamination by atmospheric carbon dioxide while cooling. (This precaution is unnecessary in preparing buffer solutions having pH valu
recession
发表于 2025-3-24 20:43:37
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弯曲的人
发表于 2025-3-25 00:03:56
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