43
berib yonishini (nima uchun?) kuzating. Gaz chiqarish nayining uchini
bromli
suv
solingan
probirkaga
tushiring
va
biroz
kuting.
eritma
rangsizlanadi. So`ngra gaz chiqarish nayining uchini KMnO
4
eritmasiga botirib,
uning
ham
rangsizlanishini
kuzating.
Uchinchi
suvli
probirkaga ham atsetilen yuboring va probirkaga KMnO
4
eritmasidan
tomizing, eritma rangsizlanadimi?
Atsetilenning hosil bo`lishi:
C
C
Ca +
2H-OH
Ca(OH)
2
+
C
2
H
2
Kal’tsiy karbid solingan probirkaga 1 tomchi fenolftalein eritmasidan
tomizib, reaktsiyada haqiqatan ham kal’tsiy gidroksid hosil bo`lganini isbotlash
mumkin.
Atsetilenning yonishi:
2C
2
H
2
+ 5O
2
4CO
2
+ 2H
2
O (to`la yonish).
Etilen molekulasidagiga qaraganda atsetilen molekulasida vodorod atomlari
kam bo`lgani uchun atsetilen ravshan alanga berib yonadi. Bromning birikishi:
HC
CH + Br
2
CHBr=CHBr + Br
2
CHBr
2
-CHBr
2
trans-brometilen simm-tetrabrometan
Atsetilenning KMnO
4
bilan oksidlanishi:
HC
CH
[O] + H-OH
HC
CH
OH OH
[O] + H-OH
CH CH
OH OH
OH OH
-2H
2
O
C
C
O
H
O
H
[O]
C
C
O
OH
O
HO
+
MnO
2
dial’degid
oksalat kislota
(glioksal’)
Atsetilen
yuborilgan
suvli
probirkada
KMnO
4
eritmasining
rangsizlanmasligiga sabab atsetilenning suvda erimasligidir.
Atsetilen ajralib chiqishi to`xtasa, probirkaga suv yoki karbid soling.
Dostları ilə paylaş: