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a) H2CO3 +Mg(OH)2 --> MgCO3 + 2H2O
b) H2CO3 --> 2(H)+ + (CO3)2- (to jest słaby kwas więc strzałki będą w dwie strony)
c) K2CO3+Pb(NO3)2 --> PbCO3↓+ 2KNO3