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Консультация № 192534
07.02.2018, 18:15
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Сколько граммов ЭДТА 2Н2О потребуется для приготовления 500 см3 раствора ЭДТА молярной концентрацией 0,02 моль/дм3.
Сколько граммов ЭДТА 2Н2О потребуется для приготовления 500 см3 раствора ЭДТА молярной концентрацией 0,02 моль/дм3.
Обсуждение
07.02.2018, 20:29
общий
это ответ
Здравствуйте, nikita-saenko1994!
Во-первых, при такой формулировке вопроса стоит уточнить, имеется ввиду этилендиаминтетрауксусная кислота (комплексон II, M=292 г/моль) или её динатриевая соль (комплексон III, M=336 г/моль для безводной соли и M=372 г/моль для дигидрата)
[offtop]Что любопытно, удивлённый взгляд "как можно не знать элементарных вещей?" в ответ на этот вопрос можно получить от приверженцев обеих версий[/offtop]
Впрочем, если вопрос про дигидрат, скорее всего, речь идёт именно о дигидрате комплексона III
а масса комплексона находится элементарно:
m=MCV=372г/моль[$183$]0,02моль/л[$183$]0,5л=3,72 г
Во-первых, при такой формулировке вопроса стоит уточнить, имеется ввиду этилендиаминтетрауксусная кислота (комплексон II, M=292 г/моль) или её динатриевая соль (комплексон III, M=336 г/моль для безводной соли и M=372 г/моль для дигидрата)
[offtop]Что любопытно, удивлённый взгляд "как можно не знать элементарных вещей?" в ответ на этот вопрос можно получить от приверженцев обеих версий[/offtop]
Впрочем, если вопрос про дигидрат, скорее всего, речь идёт именно о дигидрате комплексона III
а масса комплексона находится элементарно:
m=MCV=372г/моль[$183$]0,02моль/л[$183$]0,5л=3,72 г
5
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