Question

1. for each of the following water - soluble compounds, indicate the ions present in an aqueous solution: nai, k₂so₄, nacn, ba(oh)₂, and (nh₄)₂so₄. 8. write a balanced chemical equation showing how you could prepare each of the following salts from an acid - base reaction: kno₃, nabr, and cas.

Explanation:

Step1: Analyze NaI dissociation

When NaI dissolves in water, it dissociates into $Na^+$ and $I^-$ ions. The chemical equation for dissociation is $NaI(s)
ightarrow Na^+(aq)+I^-(aq)$.

Step2: Analyze $K_2SO_4$ dissociation

$K_2SO_4$ dissociates into $2K^+$ and $SO_4^{2 -}$ ions. The dissociation equation is $K_2SO_4(s)
ightarrow 2K^+(aq)+SO_4^{2 -}(aq)$.

Step3: Analyze NaCN dissociation

NaCN dissociates into $Na^+$ and $CN^-$ ions. The equation is $NaCN(s)
ightarrow Na^+(aq)+CN^-(aq)$.

Step4: Analyze $Ba(OH)_2$ dissociation

$Ba(OH)_2$ dissociates into $Ba^{2 +}$ and $2OH^-$ ions. The dissociation equation is $Ba(OH)_2(s)
ightarrow Ba^{2 +}(aq)+2OH^-(aq)$.

Step5: Analyze $(NH_4)_2SO_4$ dissociation

$(NH_4)_2SO_4$ dissociates into $2NH_4^+$ and $SO_4^{2 -}$ ions. The equation is $(NH_4)_2SO_4(s)
ightarrow 2NH_4^+(aq)+SO_4^{2 -}(aq)$.

Step6: Prepare $KNO_3$ from acid - base reaction

$HNO_3(aq)+KOH(aq)
ightarrow KNO_3(aq)+H_2O(l)$.

Step7: Prepare NaBr from acid - base reaction

$HBr(aq)+NaOH(aq)
ightarrow NaBr(aq)+H_2O(l)$.

Step8: Prepare CaS from acid - base reaction

$H_2S(aq)+Ca(OH)_2(aq)
ightarrow CaS(aq)+2H_2O(l)$.

Answer:

For NaI: $Na^+(aq), I^-(aq)$;
For $K_2SO_4$: $2K^+(aq), SO_4^{2 -}(aq)$;
For NaCN: $Na^+(aq), CN^-(aq)$;
For $Ba(OH)_2$: $Ba^{2 +}(aq), 2OH^-(aq)$;
For $(NH_4)_2SO_4$: $2NH_4^+(aq), SO_4^{2 -}(aq)$;
For $KNO_3$ preparation: $HNO_3(aq)+KOH(aq)
ightarrow KNO_3(aq)+H_2O(l)$;
For NaBr preparation: $HBr(aq)+NaOH(aq)
ightarrow NaBr(aq)+H_2O(l)$;
For CaS preparation: $H_2S(aq)+Ca(OH)_2(aq)
ightarrow CaS(aq)+2H_2O(l)$