Write and balance the following word reactions, and state if a precipitate is formed? Barium cyanide reacts with ammonium sulfate. Potassium hydroxide reacts with magnesium chloride.

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Write and balance the following word reactions, and state if a precipitate is formed? Barium cyanide reacts with ammonium sulfate. Potassium hydroxide reacts with magnesium chloride.

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Answer 1 · 2017-07-06T20:29:43

These are regular double-replacement reactions, of the form

$A B + C D \to A D + C B$ $AB + CD -> AD + CB$ .

Basically, the cations switch, and charge is considered when determining the number of anions per cation / cations per anion. What is the formed solid called?

So, you should get:

$2 + Ba {(1 - CN)}_{2} (a q) + {(1 + {NH}_{4})}_{2} 2 - {SO}_{4} (a q) \to 2 1 + {NH}_{4} 1 - CN (a q) + 2 + Ba 2 - {SO}_{4} (s)$ $color(blue)(stackrel(color(red)(2+))"Ba"(stackrel(color(red)(1-))"CN")_2(aq) + (stackrel(color(red)(1+))("NH"_4))_2stackrel(color(red)(2-))("SO"_4)(aq) -> 2stackrel(color(red)(1+))("NH"_4)stackrel(color(red)(1-))("CN")(aq) + stackrel(color(red)(2+))"Ba"stackrel(color(red)(2-))("SO"_4)(s))$

Is this balanced? If not, you should fix it up.

Barium cyanide is reasonably soluble in water ( $18 g/100 mL water$ $"18 g/100 mL water"$ at $25^{\circ} C$ $25^@ "C"$ ).
Barium sulfate is very poorly soluble (as we would expect from the guideline that sulfates are soluble except for those with ${Ag}^{+}$ $"Ag"^(+)$ , ${Pb}^{2 +}$ $"Pb"^(2+)$ , ${Ca}^{2 +}$ $"Ca"^(2+)$ , ${Sr}^{2 +}$ $"Sr"^(2+)$ , or ${Ba}^{2 +}$ $"Ba"^(2+)$ cations).
All ammonium-based compounds are very soluble.

$2 1 + K 1 - OH (a q) + 2 + Mg 1 - {Cl}_{2} (a q) \to 2 1 + K 1 - Cl (a q) + 2 + Mg {(1 - OH)}_{2} (s)$ $color(blue)(2stackrel(color(red)(1+))"K"stackrel(color(red)(1-))"OH"(aq) + stackrel(color(red)(2+))"Mg"stackrel(color(red)(1-))("Cl"_2)(aq) -> 2stackrel(color(red)(1+))"K"stackrel(color(red)(1-))"Cl"(aq) + stackrel(color(red)(2+))"Mg"(stackrel(color(red)(1-))"OH")_2(s))$

Is this balanced? If not, you should fix it up.

All alkali-metal-based compounds are quite soluble in water.
Halides are as well (except for those with ${Hg}_{2}^{2 +}$ $"Hg"_2^(2+)$ , ${Ag}^{+}$ $"Ag"^(+)$ , or ${Pb}^{2 +}$ $"Pb"^(2+)$ cations).
Hydroxides tend to be insoluble, and $Mg {(OH)}_{2}$ $"Mg"("OH")_2$ is no exception ( $0.00064 g/100 mL water$ $"0.00064 g/100 mL water"$ at $25^{\circ} C$ $25^@ "C"$ ).

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Write and balance the following word reactions, and state if a precipitate is formed? Barium cyanide reacts with ammonium sulfate. Potassium hydroxide reacts with magnesium chloride.

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