Giáo án hóa học lớp 12 cơ bản – Tiết 44 : KIM LOẠI
KIỀM THỔ V HỢP CHẤT
QUAN TRỌNG CỦA KIM LOẠI KIỀM THỔ
(T2)
I. MỤC TIU:
1. Kiến thức: HS biết: Nước cứng là gì ? Nguyn tắc v cc
phương pháp làm mềm nước cứng.
2. Kĩ năng: Biết cách dùng các hoá chất để làm mềm các
loại nước cứng.
3. Thái độ:
II. CHUẨN BỊ:
III. PHƯƠNG PHÁP: Nêu vấn đề + đàm thoại + hoạt
động nhóm.
IV. TIẾN TRÌNH BY DẠY:
1. Ổn định lớp: Cho hỏi, kiểm diện.
2. Kiểm tra bi cũ: Trình by hiện tượng xảy ra khi cho từ
từ khí CO
2
sục vo dung dịch Ca(OH)
2
cho đến dư. Giải
thích bằng phương trình phản ứng.

3. Bi mới:

nước mềm.
 Phn loại:
a) Tính cứng tạm thời: Gy nn b
ởi
cc muối Ca(HCO
3
)
2
v Mg(HCO
3
)
2
.
Khi đun sôi nư
ớc, các muối
class="bi x8 y2e w1 h8" 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