t ilg a n d a n k e y in n im a b o ‘la d i? K u z a tilg a n h o d is a n i
tu sh u n tirin g . Ajralib ch iq q a n kristallar stakan tubiga to 'liq
c h o ‘k k a n d a n keyin va c h o ‘k m a ustidagi e ritm a m u tlaq o
tin iq b o ‘lg an d a, oz m iq d o rd ag i (2 m l) shu e ritm a b ilan
q u ru q k a tta p ro b irk a (10 m l) ch ayq atilad i va u nga eritm a
qu yilad i. B u nd a p ro b irk ag a k ristalla rn in g tushm asligiga
e ’tib o r b erin g . E ritm a te m p e ra tu ra s in i o 'lc h a n g . A yni
te m p e ra tu ra d a b u e ritm a n i to 'y in g a n eritm a deyish m u m -
k in m i? T ex n o -k im y o v iy ta ro z id a byuksni to rtin g , q u ru q
p ip e tk a b ila n p ro b irk a d a n 3 ml e ritm a oling v ab y u k sg a
quying. B yuksni e ritm a b ila n to rtib , q u ritish shkafiga
o ‘rn atin g va 90°C d a suvi t o ‘liq b u g 'la n g u n c h a q o ‘ying.
K eyin te m p e ra tu ra n i 150°C ga k o 'ta rin g va tu z n i 30 m in
d a v o m id a q izdiring. S h u n d a n keyin byuksni tu zi b ilan
ek sik ato rd a uy te m p e ra tu ra sig a c h a soviting va to rtin g . Bu
ja ra y o n n i 150°C da q a y tarin g va yan a byuksni tu zi b ilan
to rtin g . Q u ritish va to rtish d a b ir xil n a tija olgunga q a d a r
ja ra y o n q ay tarilad i. T ajriba n atijalari quyidagi sh akld a
yoziladi:
to 'y in g a n e ritm a te m p e ra tu ra si — t°C;
e ru v c h a n lik n i an iq lash u c h u n o lin g an e ritm a hajm i —
V,
m l;
byuks m assasi —
m v
g;
byuksnin g e ritm a b ila n m assasi —
m 2,
g;
b ix ro m a t e ritm a sin in g m assasi —
m = m 2— m ^
g;
byuksning q u ru q tuz bilan m assasi, 1-tortish
m4,
g;
2 -to rtis h m ” , g;
q u ru q kaliy bixrom atning o g ‘irligi —
m = m —m v
g.
O lingan n a tija la r asosida b ix ro m a tn in g t o ‘yingan e rit
m asi (eru v ch an lig i) k o n sen tratsiy asin i fo izlard a va m o l/
litrla rd a hisoblang, e ritm a n in g zichligini a re o m e tr y o rd a
m ida aniqlang.
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