- Mau thCf cho kettua keo trSng, sau d6 bi tan dan den het Ik Al2(S04)3: Al2(S04)3 + 6 N a O H > 2 A l ( O H ) 3 i + 3Na2S
b) Xdc dinh lugng MSO4.7H2O tdch ra khi Idm Ignh 800 gam dungdich
MSO4 bao hba a 70°C xuong 20°C. Cho biet do tan cua MSO4 d 70''( Id 35,93 gam vd 20°C la 21 gam.
Clio biet: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, At = 27, S = .'i-
CI = 35,5, K = 39, Fe = 56, Cu = 64, Ag = 108, Ba = 137
LOI GIAI Oi THI HOC SINH G161 HOA HOC 9
Ldl GIAI
PUANBATBUQC
A--Cdu I- Cdu I-
a) D a n h o n hap k h i t r e n I a n lugt vao lo chuTa dung d i c h H2SO4 d a m dac, sau do cho qua lo chufa dung dich AgNOs cuoi cung t a t h u difgc CO2 t i n h k h i e t . b) Sa do t a c h : SO, đ CăOH)^ CaSOg CaSO, k h i 0 „ đ H2SO4 SO2 t i n h k h i e t
c) T^ thi nghiem 2: V i dung dich (1) t a n k h i cho d u dung dich (2) n e n
dung dich (1) la A1(N03)3 va dung dich (2) la N a O H .
Tit thi nghiem 1: D u n g dich (4) c6 the la BaCl2 hoac Na2S04 va dung dich (3) cung c6 the la BaCl2 hoac Na2S04.
Tit thi nghiem 3: Dung dich (4) la Na2S04 va dung dich (5) la CăN03)2.
Vay dung dich 1: A1(N03)3; dung dich 2: N a O H ; dung dich 3: BaCla
dung dich 4: Na2S04; dung dich 5: CăN03)2.
Cdu I I . a) V i e t phirang t r i n h p h a n ufng: 1000°c (1) CaCOg (2) CO2 + 2 N a O H (3) CO2 + N a O H -> CaO + COzt — > NazCOg + H2O (D) N a O H , N a O H -> NaHCOa (C) (4) 2 N a H C 0 3 + Că0H)2 (5) Na2C03 + CăN03)2 -
—> CaCOai + NagCOg + 2H2O -> CaCOsi + 2 N a N 0 3 -> CaCOsi + 2 N a N 0 3
(6) 2 N a H C 0 3
hoac NaHCOa + N a O H
> NaaCOg + C02t + H2O > Na2C03 + H2O > Na2C03 + H2O (7) Na2C03 + CO2 + H2O -> 2 N a H C 0 3 .
Lfll
^) - H2SO4 dac CO tac dung hap t h u ni/6c r a t tot va k h o n g c6 p h a n ijfng xay r a v d i cac k h i : SO2, CO2, O2 nen dung H2SO4 l ^ m klio cac k h i dọ - CaO cung c6 k h a n a n g h a p t h u niidc n h i f n g v i c6 p h a n ijfng v6i
SO2, CO2 n e n k h o n g d u n g CaO de l ^ m kho h a i k h i do m a chi dung de l a m k h o k h i O2 t h o i .