Chemistry, 14.10.2019 18:00 harringtonrob16

Insoluble sulfide compounds are generally black in color.
which of the following combinations could yield a black precipitate?
na2s(aq)+kcl(aq)
li2s(aq)+pb(no3)2(aq)
pb(clo3)2(aq)+nano3(aq)
agno3(aq)+kcl(aq)
k2s(aq)+sn(no3)4(aq

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A black precipitate is formed by the reaction; Li2S(aq) + Pb(NO3)2(aq) > PbS(s) + 2LiNO3(aq) and K2S(aq) + Sn(NO₃)₄(aq)→ SnS(s) + KNO₃(aq)

A double decomposition reaction is a type of reaction in which the cations exchange anion partners in the product. Sometimes, a double decomposition reaction yields a precipitate. A precipitate is a solid product of the reaction between two aqueous species.

Given the options in the question, a black precipitate is formed by the reaction; Li2S(aq) + Pb(NO3)2(aq) > PbS(s) + 2LiNO3(aq) and K2S(aq) + Sn(NO₃)₄(aq)→ SnS(s) + KNO₃(aq)

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Answer from: djdkfkfkckmfmf9919

Li₂S(aq)+Pb(NO₃)₂(aq) → PbS(s) + LiNO₃(aq)

K2S(aq)+Sn(NO₃)₄(aq→ SnS(s) + KNO₃(aq)

Explanation:According to solubility rules, metal sulfides are insoluble except Calcium sulfide(CaS), Magnesium sulfide(MgS), Barium sulfide(BaS), and those of potassium, sodium, and ammonium.Therefore, when all the other sulfides are formed during a reaction they form a precipitate that is shown to be in solid-state.Precipitates are formed during precipitation reactions when cations and anions combine to form a compound that is insoluble in water.

In our case; In the equations given, some reactions will take place to form a precipitate while others will not occur.

That is;

Na₂S(aq)+KCl(aq) → No reaction Li₂S(aq)+Pb(NO₃)₂(aq) → PbS(s) + LiNO₃(aq)Pb(ClO₃)₂(aq)+NaNO₃(aq) → No reaction AgNO₃(aq)+KCl(aq) →AgCl(s) + KNO₃(aq)K2S(aq)+Sn(NO₃)₄(aq→ SnS(s) + KNO₃(aq)

The first reaction will not occur.

The second equation is a precipitation reaction that forms lead(ii)sulfide which is a black precipitate.

The third reaction will not take place.

The fourth reaction will be a precipitation reaction forming silver chloride precipitate.

The fifth equation is also a precipitation reaction that forms tin(ii) sulfide, SnS which is a black precipitate.

Therefore; the equations that answers our question are;

Li₂S(aq)+Pb(NO₃)₂(aq) → PbS(s) + LiNO₃(aq)K2S(aq)+Sn(NO₃)₄(aq→ SnS(s) + KNO₃(aq)

Answer from: Quest

explanation:

Answer from: Quest

We first assume that this gas is an ideal gas where it follows the ideal gas equation. the said equation is expressed as: pv = nrt. from this equation, we can predict the changes in the pressure, volume and temperature. if the volume and the temperature of this gas is doubled, then the pressure still stays the same.

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Insoluble sulfide compounds are generally black in color.
which of the following combinations...

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