Question

complete and balance the following molecular equation. hbr(aq) + ca(oh)2(aq)→ express your answer as a balanced chemical equation. identify all of the phases in your answer. part b write the net ionic equation for it. express your answer as a balanced net ionic equation. identify all of the phases in your answer. a chemical reaction does not occur for this question. a chemical reaction does not occur for this question.

Explanation:

Step1: Write the molecular equation

Hydrobromic acid ($HBr$) is a strong acid and calcium hydroxide ($Ca(OH)_2$) is a strong base. The molecular - equation for the reaction is $2HBr(aq)+Ca(OH)_2(aq)
ightarrow CaBr_2(aq) + 2H_2O(l)$.

Step2: Write the total ionic equation

Strong acids, strong bases, and soluble salts dissociate in aqueous solution. $HBr$ dissociates into $H^+(aq)$ and $Br^-(aq)$, $Ca(OH)_2$ dissociates into $Ca^{2 + }(aq)$ and $2OH^-(aq)$, and $CaBr_2$ dissociates into $Ca^{2+}(aq)$ and $2Br^-(aq)$. The total ionic equation is $2H^+(aq)+2Br^-(aq)+Ca^{2 + }(aq)+2OH^-(aq)
ightarrow Ca^{2+}(aq)+2Br^-(aq)+2H_2O(l)$.

Step3: Write the net - ionic equation

Cancel out the spectator ions ($Ca^{2+}$ and $Br^-$) on both sides of the total ionic equation. The net - ionic equation is $H^+(aq)+OH^-(aq)
ightarrow H_2O(l)$.

Answer:

Molecular equation: $2HBr(aq)+Ca(OH)_2(aq)
ightarrow CaBr_2(aq) + 2H_2O(l)$
Net - ionic equation: $H^+(aq)+OH^-(aq)
ightarrow H_2O(l)$