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Câu 1 :
Cho 100 ml dd Al
2
(SO
4
)
3
tác dụng với 100 ml dd Ba(OH)
2
, thu đợc kết tủa A. Nung A đến
khối lợng không đổi thì khối lợng chất rắn thu đợc bé hơn khối lợng của A là 5,4 gam. Biết
nồng độ mol của dd Ba(OH)
2
bằng 3 lần nồng độ mol của dd Al
2
(SO
4
)
3
. Nồng độ mol của
Al
2
(SO
4
)
3
và Ba(OH)
2
trong dung dịch ban đầu là :
A. 1 M ; 3 M B. 0,6 M ; !,8 M C. 0,5 M ; 1,5 M D. 0,4 M ; 1,2 M
Câu 2 :
Khi xà phòng hoá hoàn toàn 2,52 g lipit A cần 9 ml dd KOH 1M. Mặt khác khi xà phòng
hoá hoàn toàn 5,04 g lipit A thu đợc 0,53 g glixerol. Chỉ số xà phòng hoá và chỉ số axit béo
của A là :
đề thi thử môn hoá
Thời gian làm bài: 90 phút