Ma’ruza: Eritmаlаr. Foiz, Molyar va Normal konsentratsiya eritmalarini tayyorlash. Fiksanal eritmalar tayyorlash. Reja

5. Eritmaning titri. Eritmaning 1 millilitr (sm³) da erigan moddaning gramm mikdorini kursatuvchi kiymatga eritmaning titri deyiladi.

Yukoridagi koidaga kura, xlorid kislota (HCl) eritmasining titri 0,00365 g/ml teng deylik. Bu eritmaning 1 ml da 0,00365 g. HCl erigan degan ma’noni anglatadi.

Umuman, eritmaning titri bilan molyar va normalь kontsentratsiyalari urtasida kuyidagicha boglanish bor:

Bu tenglamadan analitik kimyoda eritmalarni titrlash uchun foydalaniladi. Eritmaning 1 millilitrida erigan moddaning massa miqdori titr deb ataladi.¹⁰

1. Eritmaning titri quyidagicha aniqlanadi:

T – eritmaning titri, m – erigan modda massasi, V – eritmaning hajmi.

2. Eritmaning titri bilan normalligi orasidagi bog’lanish quyidagicha:

E – erigan moddaning ekvivalent massasi, N – eritmaning normal kontsentratsiyasi.

M i s o l. Normalligi 0,1020 ga teng bo’lgan AgNO₃ eritmaning titrini toping?

Molyar va normal kontsenratsiyalarning formulalaridan kurinib turibdiki, eritmaning kontsentratsiyalari eritma hajmiga teskari proportsionaldir, ya’ni aniq kontsentratsiyali eritmaning hajmi avvalgisiga nisbatan necha marta ortsa, eritma kontsentratsiyasi shuncha kamayadi.

Aksariyat hollarda molyar va normal kontsentratsiyalar foiz kontsentratsiya bilan almashtirilishi yoki aksincha masalalarni hal etishga to`g`ri keladi. Shunday hollarda quyidagi formulalardan foydalanish mumkin:¹¹
;


;

1^ General chemistry : the essential concepts / Raymond Chang. – 152

2^ General chemistry : the essential concepts / Raymond Chang. – 186

3

4^ General chemistry : the essential concepts / Raymond Chang. – 5th ed

5^ General chemistry : the essential concepts / Raymond Chang. – 5th ed

6^ General chemistry : the essential concepts / Raymond Chang. – 5th ed

7^ General chemistry : the essential concepts / Raymond Chang. – 5th ed

8^ General chemistry : the essential concepts / Raymond Chang. – 5th ed

9^ General chemistry : the essential concepts / Raymond Chang. – 5th ed

10^ General chemistry : the essential concepts / Raymond Chang. – 5th ed

11^ General chemistry : the essential concepts / Raymond Chang. – 5th ed