Semua Tentang Subjek Kimia

auntie_girl

Originally posted by aku_EnSeM at 15-7-2007 10:06 PM
i wanna ask about galvanic cell/ Daniel cell...

the salt bridge thing... why dont we just use water? why must we use concentrated salt?

nama pon salt bridge

conductivity thingy kot

haku lufer ler

meitantei

Salt water has better conductivity sebab electric current boleh mengalir disebabkan pergerakan ion2 dlm salt bridge tu. Cthnya kalau pakai Potassium Chloride, ion K+ akan bergerak ke terminal negatif manakala ion Cl- akan bergerak ke terminal positif. The higher the concentration of the salt solution, the more ions there are, the more charge can be carried at one time, so better conductivity.

Water is a bad conductor of electricity. Water self ionises partially, tapi concentration ion H+ dan OH- dlm pure water sangat sangat rendah. Disebabkan dlm pure water kurang ion utk bawa cas electrik, maka bridge tu tak leh berfungsi kalau pakai air biasa jer...

auntie_girl

Originally posted by meitantei at 21-1-2008 08:40 PM
Salt water has better conductivity sebab electric current boleh mengalir disebabkan pergerakan ion2 dlm salt bridge tu. Cthnya kalau pakai Potassium Chloride, ion K+ akan bergerak ke terminal neg ...

tq dear

naq_j

aku paling suka kimia inorganik dan kimia analisis.