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Complete and balance the following equations:
(a) NaOH + _____ ------> Na2SO4 + H2O(b) Ca(OH)2 + _____ ------> CaCO3 + H2O
The complete and balanced equations are given below:
(a) NaOH + _____ → Na2SO4 + H2O
$ \begin{array}{l}
\ 2NaOH\ +\ H_{2} SO_{4} \ \rightarrow \ Na_{2} SO_{4} \ +\ 2H_{2} O
\end{array}$
(b) Ca(OH)2 + _____ → CaCO3 + H2O
$Ca( OH)_{2} \ +\ CO_{2} \ \rightarrow \ CaCO_{3} \ +\ H_{2} O$
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