+ M5u khong cho kd't tiia => mSu nude ciJng vTnh cirụ + Hai r iSu con lai deu cho kd't tiia:
Mg(HC03)2 — ^ M g C 0 3 ; +CO2T + H2O
CăHC03)2 — ^ C a C O j i + CO, t + H.O - Loc bo kd't tiia trong hai mSu con lai, cho dung djch NajCOj v^o:
+ MSu cho kd't tiia => m3u nu6c ciing toan phSn:
CaCU + K2CO3 -> CaCOj i + 2KC1 :
CaS04 + K2CO3 C a C O j i + K2SO4
MgCU + K2CO3 -> MgCOj i + 2KC1
MgS04 + K2CO3 ^ M g C 0 3 | + K2SO4
Mg-* + 2C0^~ + 2H2O -> M g ( 0 H) 2 i + 2HCO3
+ MSu khong cho kd't tiia => m3u nu6c ciing tam thcrị
Dang 13; Bai tap viet PTPlT, chuoi phan iimg 1. Cho so do phan img:
NaCl -> (X) ^ NaHC03 -)• (Y) ^ NaN03. X va Y c5 the la •
Ạ NaOH va NaClỌ B. NaOH va Na2C03. C. N a a 0 3 va Na2C03. D. Na2C03 va NaClỌ
Phan loai vd phuang phdp giai nhanh BT Hoa hoc 12 -Cu Thanh Toan Huong đn gidi
X va Y C O the la NaOH va Na.CO,:
NaCl > NaOH > NaHC03 > Na.CO, > NaNO, NaCl + 2 H,0 > 2NaOH + CU + H ,
m.n " " •, :,,
2NaHC03 — ^ NaoCOj + CO, + H2O
hoac NaHC03 + NaOH > NâCOj + H.O
Dap an dung la B. 2. Cho so d6 chuyen hoa sau:
C a O- ^ ^ C a C l 2- ^ ^ C a ( N 0 3) 2- ^ ^ C a C 0 3 ! Cong thirc cua X, Y, Z Mn lirot la
Ạ HCl, HNO3, NạCOj B. CU, AgNO,, MgCOj
C. HCl, AgNO,, NâCOj D. CU, HNO3, CO,.
Huong đn gidi
PTHH: CaO + 2 H C l->CaCl2+ H 2 0 (X)
CaCl2 +2AgN03 -^CăN03)2 + 2 A g C U ( Y )
CaCNOj), + Na2C03 > CaCO, + ÍNaNO,
(Z)
Dap an dung la C. 3. X la mot peoxit kim loai ki^m c6 mau da cam, trong do oxi chiem 4 1 % ve khoi
luomg. Trong so 66 phan ling:
X , »X ^"2" ) X 2 >X3 > X , . thi X„ X , . X3 iSn luot la
Ạ Na202,NaOH,02 B. 02,Na0H,NaN03