r2\r? O\rCa CaO + H2O==Ca(OH)2 Ca(OH)2\r?\rO Ca(OH\rBa BaO + H O==Ba(OH) Ba(OH) )2\r2 2 2\rO \r0\rIõ2ö÷I\r1 C 01 !"#$%&'(2 ):\r+#,-#.\r/0#123(3 456 5!7\r8 ?.\r2 9 : ; < = NaOH: Ca(OH)2+Na2co3==CaCO3 I\r+2NaOH:\r{?@A!Ca(OH)2+Na2co3==CaCO3 I +2NaOH\rB Ca(OH)2+K2co3==CaCC>3 I +2KOH }\r3 CDEF?!GHI?JKLF KpMNOC1\rPQ HC1\H2so4 OLRS#TUVLF?WXY\r4Z[\]^_`abc:1M\dFe2O3+6HCl=2FeCl3+3H2O;\r2 efgHhijFe+2HCl==FeCb+H2 f k\rlmnopq