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Nội dung: <blockquote data-quote="black_justtry" data-source="post: 113954" data-attributes="member: 149227">2) Trích mẫu thử. Mẫu thử có mùi khai là <img src="https://codecogs.izyba.com/png.latex?\150dpi NH{3}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />. Thêm quỳ tím vào các mẫu thử còn lại.-Quỳ hóa xanh là <img src="https://codecogs.izyba.com/png.latex?\150dpi NaOH" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> và  <img src="https://codecogs.izyba.com/png.latex?\150dpi K{2}S" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />.-Quỳ hóa đỏ là  <img src="https://codecogs.izyba.com/png.latex?\150dpi Pb(NO{3}){3}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />.-Quỳ không đổi màu là  <img src="https://codecogs.izyba.com/png.latex?\150dpi KI" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> và  <img src="https://codecogs.izyba.com/png.latex?\150dpi NaCl" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /><img src="https://codecogs.izyba.com/png.latex?\150dpi Pb^{2+}+H{2}O \Leftrightarrow Pb(OH)^{+}+H^{+}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />-Cho  <img src="https://codecogs.izyba.com/png.latex?\150dpi Pb(NO{3}){3}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />  vào  <img src="https://codecogs.izyba.com/png.latex?\150dpi NaOH" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />,  <img src="https://codecogs.izyba.com/png.latex?\150dpi K{2}S" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /> ,  <img src="https://codecogs.izyba.com/png.latex?\150dpi KI" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />,  <img src="https://codecogs.izyba.com/png.latex?\150dpi NaCl" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />+ xuất hiện kết tủa vàng là  <img src="https://codecogs.izyba.com/png.latex?\150dpi KI" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />:<img src="https://codecogs.izyba.com/png.latex?\150dpi Pb^{2+}+ 2I^{-}\rightarrow PbI{2}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />+ xuất hiện kết tủa trắng là   <img src="https://codecogs.izyba.com/png.latex?\150dpi NaCl" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />:<img src="https://codecogs.izyba.com/png.latex?\150dpi Pb^{2+}+ 2Cl^{-}\rightarrow PbCl{2}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />+ xuất hiện kết tủa đen là   <img src="https://codecogs.izyba.com/png.latex?\150dpi K{2}S" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />:<img src="https://codecogs.izyba.com/png.latex?\150dpi Pb^{2+}+ S^{2-}\rightarrow PbS" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />+xuất hiện kết tủa trắng tan lại là  <img src="https://codecogs.izyba.com/png.latex?\150dpi NaOH" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /><img src="https://codecogs.izyba.com/png.latex?\150dpi Pb^{2+}+ 2OH^{-}\rightarrow Pb(OH){2}" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /><img src="https://codecogs.izyba.com/png.latex?\150dpi Pb(OH){2}+ 2OH^{-}\rightarrow PbO{2}^{2-}+2H{2}O" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /></blockquote>

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