Cho 300 ml dd A có chứa các ion NH4+; Ba2+; Cl-; NO3- . Chia dd A làm 3 phần bằng nhau. P1: Cho tác dụng với dd NaOH dư thì thu được 448 ml khí ở đktc. P2: Cho tác dụng với dd axit H2SO4 dư thì thu được 23,3 gam kết tủa. P3: Cho tác dụng với dd AgNO3 dư thì thu được 14,35 gam. Tính nồng độ từng ion trong dd. Giúp mk nhé ^^ Đang cần gấp , mai cô chủ nhiệm Hoá kiểm tra :)

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Đáp án:

Giải thích các bước giải:

nNH4+=NH3=0,448:22,4=0,02(mol)

nBa2+=nBaSO4=23,3:233=0,1(mol)

nCl-=nAgCl=14,35:143,5=0,1(mol)

Bảo toàn ion ta có: nNH4++2xBa2+=nCl-+nNO3-

=>nNO3-=0,12(mol)

Nồng độ NH4+=0,02:0,3=0,067

Nồng độ Ba2+=0,1:0,3=0,333

Nồng độ Cl-=0,333

Nồng độ NO3-=0,4

\(\begin{array}{l} P1:N{H_4}^ + \, + \,O{H^ - } \to N{H_3} + {H_2}O\\ {n_{N{H_4}^ + }} = {n_{N{H_3}}} = 0,02\\ P2:S{O_4}^{2 - } + B{a^{2 + }} \to BaS{O_4}\\ {n_{B{a^{2 + }}}} = n \downarrow = 0,1\\ P3:C{l^ - } + A{g^ + } \to AgCl\\ {n_{Cl - }} = {n_{AgCl}} = 0,1\\ BTDT:{n_{{\bf{N}}{{\bf{H}}_{\bf{4}}}^ + }} + {\rm{ 2n}}{{\rm{ }}_{{\bf{B}}{{\bf{a}}^{{\bf{2}} + }}}} = {\rm{ n}}{{\rm{ }}_{{\bf{Cl}} - }} + n{{\rm{ }}_{{\bf{N}}{{\bf{O}}_{\bf{3}}}^ - }}\\ => n{{\rm{ }}_{{\bf{N}}{{\bf{O}}_{\bf{3}}}^ - }} = 0,12 \end{array}\) => Nồng độ các ion

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