For this experiment, the possible categories of the unknown are alkane, alkene, alkyl halide, alcohol, phenol, amine, aldehyde, ketone, and carboxylic acid… :�e�&���zœ�n��� Physical evaluation. endobj Hold the loop with the solid ionic compound in the hottest part of the flame and record the characteristic colour. But due to many chemical experiments and space explorations, many new compounds emerge which need to be identified. Investigate the reactions of carboxylic acids, Home Economics: Food and Nutrition (CCEA). Identifying Unknown Compounds. Determine cation present in compound based upon a flame test. Take a piece of nichrome wire with a loop at one end. endobj <> All of these properties suggest that the compound was ionic because ionic compounds do not have a distinct odor and are solid at room temperature because of their high melting points. Chemical evaluation Repeat for all the solid ionic compounds available, cleaning the wire loop each time. Compounds can be identified by two examinations like. Determine the mass of water in hydrated crystals, 3. In finding an unknown ionic compound we need to dissolve ionic compound in deionized water solution, as the compound is ionic so the compound will be dissolve in water (on basic of like dissolve l view the full answer Gas Chromatography: Identifying Unknown Compounds Author: V. M. Pultz Last Update: October 22, 2015 Introduction Most materials that we encounter are mixtures, and this includes food, gasoline, car tires, sea water, animals, and the list goes on and on. Chemistry Lesson: Identifying Ionic vs. Molecular Compounds Our tips from experts and exam survivors will help you through. When identifying unknown ions present in a solution, we will focus on either the anion OR the cation, never both at the same time. <> x��[[���~7��0�����A����� ��y�����a�TEʛ���\fHɡd�0��p.���ˌޝ�r�oZ�����6�십���}ݶ��_����۲������Oo���H2O�P�ǡ�t|��/��Ƿo~_�����U�Vb}�VO�p�?��U���V����W9�m�p��o�0��;�����O��@ a��q��p��a�����yq�RY�E��{�t���x�p��_��x��"����o�52�5��$E��^��%��xZ�' F�aޮ�U����i� PEҋ{9�hU�{J�c�s����+|�����R�JB/��y4�m�|U-�Z"�;��ʈ?W/�D���~���u�z�W�x����H�m\jSnoq��7i�-[J×"NO���]�}�F����'~��G4�ˁ�����`z���"aj@XGM�y>,�)���k)���Uӊ�� [�>��wn� �{�e~ݬcp�g�/W�?�&���=ٹQM�*�X����&��w��l%��r� �^�s"��d2vQY�eE�؊4��*�"��OU{��� ��$��\��t{�"5�Mj|���/uC�+ ~H�e�~hD���'���D�7#���jA�~.� ,@����h/�U�j�D^m1b�{z؈��.ۢ;��N����65���FV������Y�%,�Mg���e����^_s4u"(��Uy����V&x��@q!e����U�;6��`f�#��LnE^Z�˥��RES_�'AtU�`�ۂ�a�|,A$@�L����+iDvQ���0 �;��Ҫ���ҋ�����:>��uj�G{Q�`��;��8�p2��ES�r��3n�n,�=���䚢b/��)F�UQ� ��17���l� Y��&�P����/��E �#���8�� �����3���Kn�>��Б;\�i�p:��Rկ.,�#/��ᮥ%��x�/���������Z��u ���{�P�U��'F6��JY�6��t(�D ��n��ɪ�]W�h)���n f1�#=��*�i;*\;���w!�HF�!8��GD��q��? impurities are removed. Even if you find one, you can follow few steps mentioned below in identifying the unknown compound. We … In this experiment you will carry out several tests to identify the cations and anions in ionic compounds. You will need to use your knowledge of solubility rules and precipitation reactions to devise and carry out a plan to identify unknown solutions. <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Overview: In this experiment, you will combine both spectroscopy and qualitative tests to identify an unknown organic compound. 4 0 obj <>>> Often we want to determine the composition of a mixture, and a common approach is to separate the components of the mixture. 1 0 obj The unknown compound was then tested for solubility in water, toluene and acetone. �G'A���mˆ�n-��h����LD�J��S]�1�bDz�L(Й9�%F��Y�$�.�9�3JK/U6�G�����zf����{����-0��dw^�vҰLjDs���A�¼���T�|흊�VѾ�z���+����t���:4f'��WWذ�G�TkB7��Y�EC���n��沪HJ4Fk֢YE2M��v��R�50���ڣF>� q��l�� �RӞ�t�?�d���[�vv����5^���ȼ-��]�0M��[l {�]���~�e(�Wb�:�ژ��M�uE7q�E���2@�P�uP � E�@�U�,2�Q8y����kX�;��3��3�� There are 2 types of tests that can be used - Flame tests and Precipitation tests, Identifying cations using hydrochloric acid, Safety - Follow safety advice given by teacher. Identifying the ions in an ionic compound using chemical tests, There are 2 types of tests that can be used -, Sodium chloride, calcium chloride, lithium chloride, potassium chloride, copper(II) sulfate (1 g per salt per group), Concentrated hydrochloric acid (teacher to control and dispense small quantities or 2 mol/dm, hydrochloric acid may be used as an alternative). Dip the loop in the concentrated hydrochloric acid and place in the hot blue flame of the Bunsen burner. Run anion tests to determine present anion (carbonate, sulfate, nitrate, acetate, chloride… stream Read about our approach to external linking. Repeat until the flame is no longer coloured, i.e. 3 0 obj endobj Identifying the ions in an ionic compound using chemical tests. 1. Identifying the ions in an ionic compound using chemical tests. Dip the clean nichrome wire in concentrated hydrochloric acid and the wire onto the solid ionic compound which is sitting in a watch glass. 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