Ch_322b_18.19

Ch_322b_18.19 - Chapter 18.19 lecture note

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Derivatives of Carbonic Acid Carbonic acid (H 2 CO 3 ) is unstable and dissociates to CO 2 and H 2 O. The reaction is reversible so when CO 2 dissolves in water some H 2 CO 3 is formed. Carbonic acid is a weak acid, pK a (1) = 6.36. Solutions of carbonated water (including natural rainwater) are slightly acidic. HOCOH O = carbonic acid CO 2 + H 2 O
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Derivatives of Carbonic Acid Many stable derivatives of carbonic acid are known: Monoderivatives of Carbonic Acid are Unstable C 2 H 5 O C OH O = CH 3 CH 2 OH + CO 2 H 2 N C OH O NH 3 + CO 2 Cl C OH O HCl + CO 2 Cl C Cl O phosgene (carbonyl chloride) H 2 N C NH 2 O urea (carbamide) C 2 H 5 O C OC 2 H 5 O ethyl carbonate C 2 H 5 O C Cl O ethyl chlorocarbonate H 2 N C OC 2 H 5 O ethyl carbamate (a "urethane")
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Some Important Industrial Processes Phosgene, ClCOCl, is an important industrial chemical used in producing many other materials. It is produced on large scale from carbon monoxide and chlorine. CO
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Ch_322b_18.19 - Chapter 18.19 lecture note

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