Закінчити рівняння реакцій:
1. Ca[tex] ^{+2} [/tex] + CO[tex]Ca + CO_{3}^{-2} ---> CaCO_{3} [/tex]
2. Ba[tex] ^{+2} + SO_{4}^{-2} ---> BaSO_{4} 
3. H^{+} + OH^{-} ---> H_{2}O[/tex]
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