9-laboratoriya ishi: Suyuqlik sirtidagi sirt faol moddaning adsorbsion qavat qalinligini aniqlash

Stalogmometr.
Tajriba vaqtida turtki, zarbalar, xavo tebranishlari va xarorat o’zgarishlariga yo’l qo’ymaslik kerak.
Toza kolbalarda spirtlarning 0,50; 0,25; 0,10; 0,05; 0,02; 0,01; 0,005 konsentratsiyali suvdagi eritmalari tayyorlab, avval toza suvning va tayyorlangan eritmalarning oqib o'tishdagi tomchilar soni aniqlanadi.
O’lchamlar 3-4 marta takrorlanadi va ularning o’rta arfimetik qiymatlari olinadi. Sirt taranglikni formula bo’yicha xisoblanadi.

σ₀-suvning sirt tarangligi; n_suv-suv tomchisi soni; n_spirt-spirt tomchisi soni;

σ₀-ning qiymati ma’lumotnomadan olinadi. Olingan natijalar 2.1- jadvalga yoziladi.
1-jadval ma’lumotlari bo’yicha σ₀ = f(c) bog’lanish egri chizig’i chiziladi. Buning uchun 5-7 ta nuqtasini (eksperimental qiymatlar), ular orqali urinma chiziqlarni ordinata o’qi bilan kesishguncha davom ettiriladi.

№	Konsentrasiya C kmol /m^3	Tomchilar soni		Sirt taranglik σ, H/m
		Tajribada olinigan	o’rtacha qiymati
		1
		2
1.		3
		1
		2
2.		3

Urinma chizib o’tkazilgan nuqtalar orqali absissa o’qiga parallel chiziqlar chizib, ordinata o’qi bilan kesishguncha davom ettiriladi. Xosil bo’lgan A kesmaning uzunligi o’lchanadi. A kesmaning sirt taranglik birliklarida ifodalangan qiymati quydagicha ifodalanadi:

A ning olingan qiymatlarini Gibbs tenglamasiga qo’yamiz:

Xisoblash natijalari jadvalga yoziladi.

2-jadval

№	Konsentrasiya С kmol/m^3	A, n/m	Г * 10^10, kmol/m^2			С 10^-7
1
2
3

Jadval ma’lumotlari bo’yicha С/Г=£(с) bog’lanish egri chizig’i chiziladi. Bu grafikdan adsorbsiyaning chegaraviy qiymatini va sirt faol modsa molekulasini o’lchamini (S₀) xisoblash mumkin.

 - maksimal adsorbsiya;  -Avagadro soni.

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