Question
Asked Feb 14, 2019
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Table 4.5 (data)
Unmelted sample Melted sample
Solution Color_______________ ____________
Result of adding AgNO3 to test solution______________ _____________
Result of adding NH4SCN to test solution_____________ _____________
Result of adding K4Fe(CN)6 to test solution____________ _____________

4.6 (report)

Test or observation is a composition change indicated?
Solution color _________(Yes or no)
Addition of AgNo3 _________(Yes or no)
Addition of NH4SCN _________(Yes or no)
Addition of K4Fe(CN)6 _________(Yes or no)

Photo 3 shows the rauts of adding ammonium thiocyanate solution
appgarance of ถach solution beforu adding ammonium thiocyanate is
Photo 4 shows the results of adding potasaum Serrocyanide solution
appearance ofeach sclution before adding potasaium Serrocyanide
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Photo 3 shows the rauts of adding ammonium thiocyanate solution appgarance of ถach solution beforu adding ammonium thiocyanate is Photo 4 shows the results of adding potasaum Serrocyanide solution appearance ofeach sclution before adding potasaium Serrocyanide

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Expert Answer

Step 1

Analysis of a substance are not always meant to break the ultimate constituents from which it is formed, it also refers to a method used for the identification of its constituents and the nature of that particular substance.

When qualitative analysis for inorganic salts are performed , our main motive is the identification of the cations and anions present in the given inorganic salt. These qualitative analysis are carried out through those reactions which can be sensed through our senses such as smell and sight,etc.

Step 2

The main aspects that are involved in such reactions are:-

  • Color change which is visible from eyes
  • Formation of some precipitate during the course of the reaction
  • Evolution of the gases present in the given salt.

 

Systematic analysis of these inorganic salts is followed by using the procedure below :-

  • Preliminary examination of the given inorganic salt in solid state as well as in solution form
  • Determination of anions by carrying out reactions or tests known as wet tests followed by their confirmatory tests.
  • Determination of cations by carrying out reactions or tests known as wet tests followed by their confirmatory tests.

The first part of the above procedure yields significant information about the constituents of the salt which helps in performing the further procedures more effectively as it gives very important clues about the cations and anions that are present in the given inorganic salt. They are also known as dry tests as they take relatively shorter time of about 10-15 minutes where we make analysis about the color , state and smell of the given inorganic sample to be tested. Sometimes the solubility of the given sample is checked

Step 3

under this category.Gases evolved while performing these preliminary tests with dilute sulfuric or dilute hydrochloric acid also give a good idea about the presence of acidic radicals, therefore theses tests are performed before the confirmatory tests.

In the given data, we need to analyze the melted and unmelted sample of the FeCl3 and...

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