3. the supernatant is colorless after the addition of the additional 2 drops of

Question

3. the supernatant is colorless after the addition of the additional 2 drops of conc nh3 what can you conclude? Experiment 39 Qual II. Ni2+, Fe3+ 3+ 2+ Nickell) ions precipitates. Nickal) os ad iranll) ins fight) readily form hydroxide rve and utilize the chemical and physical properties of Ni rate and identify the presence of ntify the presence of one or more of the cations, Ni2", Fe,A" , Fe". A, Zn2+ in an aqueous solution OBJECTIVES lowing techniques are used in the Experimental Procedure: TECHNIQUES 17b 11¢ 13b o review Dry Lab 4. A, B, C for additional techniques. e Qual cations are perhaps more relevant to our industrial society than the Qual 1 onsThe use of iron as the major component of steel, of aluminum for lightweight struction materials, and of zinc for coinage alloys and galvanizing steel are all familia ur everyday lives. Aqueous solutions containing these cations tend to be quite colorfiul ell-the rust color of Fe and the green color of Ni-as well as the compounds that irm the presence of Fe and Ni*. However, solutions containing Al and Zn ten colorless, but the compounds that confirm their presence do have color. Only Cu e Qual I cations has color (sky-blue) as does its confirmation (deep dark blue) INTRODUCTION 3A 10 12 Ar3 N2- Fe Cations of the Qual Il Group h the following chemistry of the Qual II cations, the Experimental Procedure. Prelaboratory Assignment question 6 before begin- s a way to understand the separation and identification of these four cations, read experiment Alt and Za from the Ni2* and Fe cations is accomplished by NaOH solution (Figure 39.1). Thereafter, the Al mplete the flow diagram in and characteristically identified through pH control. Figure 39,1 Ta the Fe" and Np are independeny intified olumnum hydrowide prf t e precipilate lition of a highly conce

Explanation / Answer

Solution :-

The addition of the excess NH3 causes the ions to form the complex ions which are soluble therefore the color of the solution may disappear. So we when we add the excess NH3 and the color of the supernetent is changed to color less this means the complex ion is forming in the reaction mixture which is soluble in aqueous phase.

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