NH2-CH2-COOH - альфа-аминоэтановая или аминоуксусная (ГЛИЦИН)
Нужно добавить раствор щелочи. Хлорид аммония даст аммиак, который определится по характерному запаху.
NH4Cl + KOH = KCl + NH3 (газ) + H2O
<span>Cu2S + HNO3 = Cu(NO3)2 + SO2 + NO +H2O.</span>
<span>2</span><span>HNO</span>3<span> => 2</span><span>NO</span><span> + </span><span>H</span>2<span>O</span><span> + 3</span><span><u>O</u></span>
<span /><span>Cu</span>2<span>S</span><span>=> 2</span><span>Cu</span><span>(</span><span>NO</span>3<span>)</span>2<span> + </span><span>H</span>2<span>SO</span>4
<span>Cu</span>2<span>S</span><span> + 4</span><span>HNO</span>3<span> => 2</span><span>Cu</span><span>(</span><span>NO</span>3<span>)</span>2<span> + </span><span>H</span>2<span>SO</span>4
<span>5</span><span><u>O</u></span><span> + Cu</span><span>2</span><span>S + 4HNO</span><span>3</span><span> => 2Cu(NO</span><span>3</span><span>)</span><span>2</span><span> + H</span><span>2</span><span>SO</span><span>4</span><span> + H</span><span>2</span><span>O</span>
<span>3<span>Cu</span>2<span>S</span> + 22<span>HNO</span>3 => 6<span>Cu</span>(<span>NO</span>3)2 + 3<span>H</span>2<span>SO</span>4 + 10<span>NO</span> + 8<span>H</span>2<span>O</span></span>
<span><span><span>1) сульфит натрия Na2SO3 - восстановитель.</span></span></span>
<span><span><span>2) сульфид меди Cu2S - восстановитель.</span></span></span>
<span><span><span>3) <span>Нитрат меди(II) Cu(NO3)2</span> - окислитель.</span></span></span>
<span><span><span>4) Оксид азота(<span>II)</span></span></span></span><span> NO - окислитель.</span>
<span>5) Вода H2o - восстановитель.</span>
n(AgNO3) = 16.9/170 ≈ 0.0994 моль
C = n/V = 0.0994/8 ≈ 0.012 моль/л
