. .
( ) − Na2H2Y:
NaOOC CH2 CH2 COOH
N − CH2 −CH2 − N
HOOC CH2 CH2 COONa.
, , (108 /3 22 ), .
. , .
Na2H2Y2H2O.
. . , . . : , , , -. ( ), - . ϳ 䳺 , , , 7 − 11 - . , .
Ca2+ Mg2+ . , 䳿 , , pH ( 9−11). : Cu(), Fe (), Mn ().
2.
1. ν() ' V, − /3:
c ()= .
. , , : . , , Y − , c ()∙ V (X) = c (Y) V (Y).
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2. − () − 1 3 :
() = = /3,
3.
ᒺ , . . .
1. H2C2O42H2O 5,1752 ᒺ 250 3. H2C2O42H2O (f (H2C2O42H2O) = 1/2).
ʼ :
1. (H2C2O42H2O) −?
T (H2C2O42H2O) = = = = 0,0207 /3.
2) c (H2C2O42H2O) −?
c (H2C2O42H2O) = = =0,3284 .
M (H2C2O42H2O) = f (H2C2O42H2O) M (H2C2O42H2O) =1/2 126,06 =
63,03 /.
³: 0,02070 /c3; c (1/2 H2C2O42H2O) 0,3284 .
, , . M (), ᒺ V () c () :
m (X) = M () c ()10−3,
10−3 − 3 1 3.
, c ()∙ V (X) = c (Y) V (Y). :
c () = .
2. 0,2 . Ba(OH)2 ᒺ 500 3 ᒺ . 30,25 3 46,25 3 0,1280 . HCl. ()2.
ۥ :
1. m ( Ba(OH)2) −?
m (Ba(OH)2) = M (1/2 Ba(OH)2) c (1/2 Ba(OH)2) V (Ba(OH)210−3 = 85,6630,250010−3 = 8,5663 .
2. c (Ba(OH)2) −?
c (Ba(OH)2) = = = = 0,1957 M.
³: ()2 8,5663 , 0,1957 .
3. Na2CO3 , 0,2840 100 3, ᒺ 0,1000 HCl, ᒺ 10,00 3 4,85 3. .
ۥ :
1. f (Na2CO3) −? (1/2Na2CO3) −?
䳿 :
Na2CO3 + 2HCl 2NaCl + H2O + CO2.
, Na2CO3 䳺 HCl, Na2CO3 i , (Na2CO3) = 1/2 f (Na2CO3) 1/2.
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(1/2Na2CO3) = 1/2 M (Na2CO3) = 52,995 /.
2. w(Na2CO3) −?
w(Na2CO3) = 100 % =
100 % = 90,5 %.
³: Na2CO3 90,5 %.
4. Na2B4O710H2O , 0,8530 19,83 3 0,2100 HNO3.
ۥ :
1. f (Na2B4O710H2O) −? M (Na2B4O710H2O) −?
䳿 :
Na2B4O710H2O + 2HNO3 2NaNO3 + 5H2O + 43O3.
f (Na2B4O710H2O) = 1/2, f (Na2CO3) 1/2.
M (Na2B4O710H2O) = 1/2 M (Na2B4O710H2O) = 190,71 /.
2. n(HNO3), −?
n(HNO3) = (HNO3) V (HNO3)10−3 = 0,210019,8310−3 = 0,004164 .
3. m (Na2B4O710H2O), −?
n(HNO3) = n(Na2B4O710H2O).
m (Na2B4O710H2O) = n(Na2B4O710H2O) (Na2B4O710H2O) =
0,004164190,71 = 0,7941 .
4. w(
Na2B4O710H2O) −?
w(
Na2B4O710H2O) = 100 % = 93,11 %.
³: Na2B4O710H2O 93,11 %.