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Exercício de Produto ionico
Exercício:
O ph da urina varia enter 4,5 e 8,0, e isto acontece devido à capacidade tamponante dos rins. um dos tampões mais importantes nesse processo é o fosfato.
H2PO4 + H2O -> HPO4 + H3O , PKa= 6,8
Com base na equação acima, supondo que uma amostra de urina tenha indicado pH =7,8, a relação [HPO4]/[H2PO4] será?
pKa=-log Ka => Ka=10-6,8
pH=-log [H3O+] => [H3O+] =10-7,8
Ka=[HPO4-]X[H3O+]/[H2PO4] => 10-6,8=[HPO4-]X10-7,8/[H2PO4] =>
[HPO4-]/[H2PO4]=10-6,8+7,8=10
Respota: 10
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