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Консультация № 186509
08.08.2012, 14:04
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Определите pH буферной смеси, содержащей равные объемы растворов NH4OH и NH4Cl с массовыми долями 5,0 %. (Ответ: 9,41)
Определите pH буферной смеси, содержащей равные объемы растворов NH4OH и NH4Cl с массовыми долями 5,0 %. (Ответ: 9,41)
Обсуждение
11.08.2012, 02:56
общий
это ответ
Здравствуйте, Massimo!
Отличием плотностей от плотности воды пренебрежём.
Пусть изначально было по 1 л каждого раствора.
Массы веществ:
mNH4OH=mNH4Cl=1000мл*1г/мл*5%=50 г
Количества веществ
nNH4OH=50г/35г/моль=1,42 моль
nNH4Cl=50г/53,5г/моль=0,935 моль
pH находим по формуле буферного раствора (обратите внимание, концентрацию находить необязательно!):
pH=pKa+lg([NH4OH]/[NH4+])[$8776$]pKa+lg(CNH4OH/CNH4Cl)=pKa+lg(nNH4OH/nNH4Cl)=9,25+lg(1,42/0,93)=9,43
Отличием плотностей от плотности воды пренебрежём.
Пусть изначально было по 1 л каждого раствора.
Массы веществ:
mNH4OH=mNH4Cl=1000мл*1г/мл*5%=50 г
Количества веществ
nNH4OH=50г/35г/моль=1,42 моль
nNH4Cl=50г/53,5г/моль=0,935 моль
pH находим по формуле буферного раствора (обратите внимание, концентрацию находить необязательно!):
pH=pKa+lg([NH4OH]/[NH4+])[$8776$]pKa+lg(CNH4OH/CNH4Cl)=pKa+lg(nNH4OH/nNH4Cl)=9,25+lg(1,42/0,93)=9,43
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