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1 ) calcule o pH e a concentração de Ion oxalato, [C2O4²-] em uma solução 0,02 mol/l de acido oxalato ( H2C2O4). Considere Ka1 = 5,9 x 10-² e Ka = 6,4 x 10^-5.
2) Calcue a % de molecula de HF ionizadas em :
a) uma solução de HF 0,10 mol/l
b) uma solução de HF 0,010 mol/l
considere Ka = 6,8 x 10^-4
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