0,2 x
H2SO4+K2CO3=K2SO4+CO2+H2O
1 1
m(K2CO3)=m(р-ра)хω=110х0,25=27,5 г.
n(K2CO3)=m/M=27,5÷138=0,2 моль
n(CO2)=x=0,2х1÷1=0,2моль
V(CO2)=Vmхn=22,4л./моль×0,2моль=4,48л.
ответ: 4,48л.
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Соли металлов применяются для окрашивания фейерверков в различный цвет. Один из качественного анализа *сухим методом* является окрашивание пламени катионами металлов. Определите, катионы каких металлов дают фееверку желтый, карминово-красный и желто-зеленый цвет: Желтый: Карминово-красный: Желто-зеленый:
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