2P+3Mg=Mg3P2
Mg3P2+<span> 4О2 -> 3MgO + P2O5
2MgO+2HCO3=2MgCO3+H20
MgCO3=Co2+MgO
8CO2+2Ca(Oh)2=2Ca(HCO3)2
Ca(HCO3)2+k2Co3=CaCo3+2KHCO3</span>
Дано:
m в-ва=15 г
m(H2O)=200 г
_______________
W-?
W=m в-ва/m р-ра *100%
m р-ра=200+15=215 г
W=15/215*100%=6.98%
H3PO4+AgNO3 = AgPO4+ 3 HNO3
СaCl2 + Pb(NO3)2 = Ca(NO3)2 + PbCl2
Ca(+2) + 2Cl(-) + Pb(+2) + 2NO3(-) = Ca(+2) + 2NO3(-) + PbCl2
Pb(+2) + 2Cl(-) = PbCl2
NaBr + AgNO3 = NaNO3 + AgBr
Na(+) + Br(-) + Ag(+) + NO3(-) = Na(+) + NO3(-) + AgBr
Ag(+) + Br(-) = AgBr