Mavzu: modda va uning xossalari

19-Laboratoriya ishi: KALSIY GIDROKSIDI VA FOSFAT KISLOTA ERITMASINING INDIKATORLARGA TA'SIRINI TEKSHIRIB KO'RISH.
Maqsad: indikatorlarning rangi kislota va asos eritmalarida qanday o'zgarishini kuzatish.
Jihozlar: polipropilen stakan 150 ml (1), tomchi analizi uchun to'plam (2), probirkalar (3), probirkalar uchun shtativ (4), shisha tayoqcha (5), shpatel (6), tomchi analizi uchun planshet (7), plastik taglik (8), universal indikator qog'ozi (9), shishaga yozish uchun qalam (10), shisha stakan (11), avtomatik mikropipetka.
Reaktivlar: Kalsiy gidroksidi va fosfat kislotalarning suyultirilgan eritmalari, metil zarg'aldog'i, fenolftalein eritmasi.

Jihozlar to'plami avtomatik mikropipetka
Islini bajarish tart ibi:

1. 
   Probirkalar shishaga yozadigan qalam yordamida 1 dan 6 gacha raqamlanadi.
   
2. 
   1,2, 3-probirkalarga avtomatik pipetka yordamida 0,5 ml dan kalsiy gidroksidi solinadi.
   

1. 
   Birinchi probirkaga metil zarg'aldog'i, ikkinchisiga fenolftalein eritmasidan pipetka yordamida 2 tomchidan quyiladi.
   

3. 
   Uchinchi probirkaga indikator qog'ozi solinadi.
   

5. 
   Bunda eritmalar va indikator qog'oz rangining o'zgarishiga e tibor beriladi va o'quvchilar daftarlariga yozib oladilar.
   
6. 
   4,5,6-probirkalarga fosfat kislotasi eritmasidan avtomatik pipetka yordamida 2 ml dan solinadi.
   
7. 
   To'rtinchi probirkaga metil zarg'aldog'i, beshinchi probirkaga fenolftalein eritmasidan pipetka yordamida 2 tomchidan tomiziladi.
   
8. 
   Oltinchi probirkaga indikator qog'ozi tushiriladi.
   
9. 
   Tajriba natijasi izohlanib daftarlarga yozib olinadi.
   

Nazorat uchun savollar:

1. 
   Asoslar va kislotalarning indikatorlar bilan ta'siri haqida nimalarni bilasiz?
   
2. 
   Kalsiy gidroksidi metil zarg'aldog'i, fenolftalein indikator qog'ozi rangiga qanday ta'sir qiladi?
   
3. 
   Fosfat kislota eritmasi turli indikatorlar ta'sirida qanday o'zgaradi?
   

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