Kimyo bakalavr) 2021-2022 o’quv yili I semester uchun II kurs (III semestr) namangan – 2021

Tayyorlangan taqribiy konsentratsiyali KMnO₄ ishchi eritmasini shovul kislotasi bo’yicha standartlash
KMnO₄ eritmasi konsentratsiyasi boshlang’ich modda bo’lgan shovul kislotasining standart eritmasi yordamida aniqlanadi:

2KMnO₄ + 5H₂C₂O₄ + 3 H₂SO₄  2MnSO₄ + K₂SO₄ + 10CO₂ + 8H₂O

Ishning borishi:

Titrlash kolbasiga 2 ekvimol H₂SO₄ eritmasidan 10-15 sm³ silindrda o’lchab quyiladi va qum xammomida 80-90 ⁰S gacha qizdiriladi. Issiq eritmaga pipetka yordamida 10,00 sm³ H₂C₂O₄·2H₂O eritmasi o’lchab solinadi va aralashtirilib, KMnO₄ eritmasi bilan turg’un pushti rang hosil bo’lgunicha titrlanadi. Titrlash kamida 2 marta olib boriladi. Titrant hajmi byuretkadagi eritmaning sath chizig’i bo’yicha olinadi.

№	V H2C2O4, sm^3	V KMnO4, sm^3
1 2	10,00 10,00

N_H2C2O4 · V _H2C2O4 N_KMnO4·E _KMnO4

N_KMnO4 = ------------------------ g.ekv/dm³ ; T_KMnO4 = ---------------------- g/sm³

V _KMnO4 1000

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