Kimyo fanidan laboratoriya mashg’ulotlari

2-tajriba. Temperaturaning o’zgarishini kimyoviy muvozanatga ta`siri.

Krahmalga yod ta`sir ettirganimizda, ko’k rangli murakkab tarkibli barqaror modda hosil bo’ladi. Bu ekzotermik reaksiyadir. Sistemaning muvozanatini shartli ravishda quyidagi tenglama bilan ifodalash mumkin:

krahmal + yod  rangli eritma + Q

Ikkita probirka olib har biriga 2 - 3 ml dan krahmal eritmasidan quying, ustiga shuncha miqdorda suv quying. Ko’k rang paydo bo’lishiga ahamiyat bering. Probirkalardan birini qizdiring. Qizdirilganda eritma rangining o’zgar ishini Le - Shatele prinsipi asosida tushintirib bering.

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