- Hoatan het phd n2 bang dung dich HNO3 dac, nong (du) tháy c6 11,76 lit khi bay ra (dktc).
Hu&ng đngidi '
Theobaira: nKA,(sô)^ ,2H20 = ^7,4/474 - O,l(mol)
nBăOH)2 =0,2.1 =0,2(mol)
KAl (SO4 \ 2Ba (OH)^ 2BaS04 i + Al ( O H ) ^ i +KOH O,l(mol)<^ 0,2 ->0,2 -> 0,1 ^ 0,1 O,l(mol)<^ 0,2 ->0,2 -> 0,1 ^ 0,1 Al(OH)3 + K O H ^ K [ A1 (O H ) /
0,1 <-> 0,1
Vay chi thu duoc 0,2 mol BaS04 kát tua: m = 0,2.233 = 46,6(g)
Dap an dung la C.
Chu v: KAl (504)2 + 2BăOH)2 -)- 2BaS04 i + K [ A1 ( 0H ) ^ "
SÔ" + Bâ* ^ BaS04 i
A1 ^ * + 3 0H " ^ A1 ( 0H) , i
^ * ' A I(O H) 3+ O H - ^ [ A I(O H ) / "
12. Hoa tan hoan toan 0,15 mol phen chua KAl(S04)2.12H20 vao nir6c, thu duoc dung djch X. Cho toan b6 X tac dung vdi 200 ml dung djch dung djch X. Cho toan b6 X tac dung vdi 200 ml dung djch
(Bă0H)2 I M + NaOH 1M), sau phan umg hoan t o ^ thu duoc m gam két tuạ Gia trj cua m la Gia trj cua m la
A . 54,4 B.23,3 C. 46,6 D. 58,3
Hu&ng đn gidi
Theobai ra: n^^Q^^^^ =0,2.1 =0,2(mol); n^aOH =0,2.1 =0,2 mol =>n =0,2.2+ 0,2 = 0,6 mol ' =>n =0,2.2+ 0,2 = 0,6 mol '
O H "
Cty TNHH MTV DWH Khang Viet
n 9 , =0,2 mol n 3^=0,15mol;n 2-=0,15.2 =0,3mol n 3^=0,15mol;n 2-=0,15.2 =0,3mol Al S O 4 Al-^^ + 30H"-> A l ( O H) 3 i 0,15-> 0,45 -> 0,15(mol) Al(OH)3 + OH" -> 0,15 <- (0,6-0,45) Al(OH)3 bj tan hét. Al(OH) 4 . ' I l l ' 5 Bâ^ + SÔ- 0,2- BaS04 i 0,2 ^ 0 , 2 0 , 2 ( m o l ) =>m = mBaS04 = 0,2.233 = 46,6(g) Dap an dung la C. 13. Nho tir tir dung djch NaOH đn du vao dung djch X. Sau khi cac phan ung xay
ra hoan toan chi thu duoc dung djch trong sudt. Chat tan trong dung djch X la
Ạ AICI3 B. CUSO4 FeCNOj),
Hu&ng đn gidi
Chát tan trong dung djch X la AlQj:
A I C I 3 + 3 N a O H >Al(OH)3 i +3NaCl3
D. CaCHCOj),
Al(OH)3 + NaOH >Na[Al(OH)^ tan, trong su6't tan, trong su6't
Dap an dung la A .
14. Cho 400 ml dung djch E g6m AICI3 x mol/lit va Al2(S04)3 y mol/Iit tac dung vdri 612 ml dung djch NaOH I M , sau khi cac phan ling két thiic thu duoc 8,424 gam 612 ml dung djch NaOH I M , sau khi cac phan ling két thiic thu duoc 8,424 gam ket tiiạ Mat khac, khi cho 400 ml E tac dung vdi dung djch BaQ, (du) thi thu duoc 33,552 gam kd't tiiạ Ti le x : y la
Ạ 4 : 3. B. 3:4. C. 3 : 2. D. 7 : 4.
Hu&ng đn gidi '
Theo bai ra: n^^i^i^ = 0,4x(mol) ^ j . , ; , .
nAi2(so4)3 =0,4y(mol); nN,0H =0,612(mol) • Hi
Taco:
Phdn loai va phifarifj phcip ^idi nhanh BT Hoa hoc 12 - Cu Thanh Toan
* T i m y :
AI2 (SO4), + 3BaCl2 ->3BaS04 i +2AICI3
0,4y 0,144(mol)
0,4ỵ3 = 0,144=oy = 0,12|n^i2(^^)^ =0,4.0,12 = 0,048mol * T i m x:
V i nf^,,oH > 3 " A I ( O H ) = > A 1 ( 0 H ) ^ b j h o a t a n b d t .
^ , , AICI3 + 3NaOH -> A l ( O H ) , i +3NaCl
0,4x -> l,2x - ^ 0 , 4 x
J o . , AI2(SO4)^ + 6NaOH - > 2 A I ( 0 H ) 3 i +3Na2S04
0,048 -> 0,288-> 0,096 A l ( O H ) ^ + N a O H - > N a F A l ( O H ) ^ ' a —> a ( m o l ) x + 0 , 0 9 6 - a = 0,108 J 0 , 4 x - a =0,012 l,2x + 0,288 + a = 0,612 [ l , 2 x + a = 0,324 =>l,6x =0,336 = i . x =0,21 Vay x : y = 0,21:0,012 = 7 : 4
Dap an dung la I). 15. Cho dung dich h6n hop X g6m HCl I M va AICI3 1,5M. The tich dung dich h6n
hop NaOH I M va K O H 2 M n h i l u nhát cin dung de khi cho vao 100ml dung
djch X till thu duoc 7,8 gam ket tiia la
Ạ 400 m l B. 1 5 0 C . 200 ml D. 300 m l
Huong dan gidi
, , T h e o b a i r a : n ^ a =0,1.1 = 0 , l ( m o l ) = n ^
H
% 3 + = n A , c i 3 = 0 , l . l , 5 = 0,15(mol)
" A I ( O H ) 3 = ^ = 0,l(mol)
^ ' " A K A I C I , ) > " A I ( A 1 ( O H ) 3 ) ^ ^K^^)} ^ ' " h ra da bj hoa tan m6t phSn (de tính lirgng O H ' max).
PTPlT: H " + O H " -> H3O
0,1 -> 0,1 (mol) A l ' * + 3 0 H " - > Al(OH)3
0 , 1 5 - > 0 , 4 5 - ^ 0 , 1 5 (mol)
Cty TNHH MTV DVVH Khan^ Viet
A l ( O H ) 3 + G H " (0,15-0,1) ^ 0 , 0 5 A l ( O H ) 4 _ Vay n = 0 , l + 0 , 4 5 + 0,05 = 0,6(mol) ^ • ^ O H (max) ^ \ UV ;•«» : >V = 0,6
1 + 2 = 0,2 (lit) = 200 ml Dap an diing la C