Obtain your unknown weak acid or base, and dry it as instructed to do so if it is a solid. ��.9{`�D�@ We used two different methods to determine the K a of the unknown weak acid. If you find your unknown to be rather insoluble in water, try heating the solution. The first objective was to determine the concentration of the strong base, sodium hydroxide (NaOH), by continuously dispensing small amounts of it from a 50 mL burette into a beaker containing the weak acid solution of 0.1 M potassium biphthalate (C 8 H 5 KO 4.) The pKa was found to be 3.88, the Ka was found to be 1.318 x 10 -4, and the molar mass was found to be 171.9 g/mol. Course. From the titration curve, the equivalence point and the pK a of the acid will be found. If this also proves unsuccessful, you will need to switch to a 10% ethanol/water mixture. Chemistry complete lab report. x��ے�Fr���)`_ #Hl�� 8��B�6���s/���H��8#i�@~OeV�@�"�BUV�3+� �T�������i�S��E�eS�}q>������*n�c����Dzn�^TǾ�`�粮�f8��X|y]�8���-�o�� ��r�c���Uq������wwϊMq�h�����-�~�q(��ڳ�\N�Ս]|�?��u)��_���ǽ1(>�?��2�ߋ��(~8�=���9ћ�j���^ؖmwr�bb��a���B\�c�߸��՝���AsW\�r�o��Z��{�����b�wE`�������*��%�3��������5�h����`�C��P�8��t��aMJmӔݹ�Z�j����z�j�U��ߺ(ۡ+����l�`~1+��l�ƀ� }�͹�[�d�]u.ϲ��+�#VZ�e� ��C����Z������B��̯�u�uu]V���4�kz�K;l������\m�:��9A�$ ���?���|)v]��r-uSb=R`�Y�J��c���U��. <> 8 x 10-10 for Boric acid (one of the weakest), this experiment’s unknown acid solution (Ka = 1. 1. Purpose In this experiment you will learn to calibrate and use a pH probe and then construct a titration curve (graph) in order to determine the molarity and K a (acid dissociation constant) of an unknown acid. ��]��\0��>}�w��k��Y;�_����|�H;I�O�/~\rd�B�ŵN��]Hhs�����Y����g���i������y�}�@ ���y+�C��5��r� ���f�Y�X�s1��`P�E�}F�r` ��I3�;����7�� 1A����"�戞��7pB�&�a~����͟����rd�[�b�v>�6��t��x�Q����+�G^)�ezD���$Z��B�aC�I�7�0��>���~6"��-�/�;]qD�O�z\����n����|����x>gIk�7���j�cxw�V-����N�3��%��� In addition, students will determine the effect of initial concentration on the dissociation constant. Access the Virtual Lab … The Ka value is a characteristic of an acid and can be used to identify an In this lab, the identity of an unknown acid was determined through the laboratory process titration. Procedure: Be sure to wear your virtual goggles when working with in the virtual lab! %PDF-1.3 Determination of Ka of an Unknown Weak Acid: Acid-Base Equilibria During Titrations Kason Kreis September 12, 2018 CHM 114, RX Purpose: This lab was designed to learn how to determine an acid dissociation constant, K a of an unknown solution based on … Determination of the Ka of a Weak Acid and the Kb of a Weak Base from pH Measurements 1 ... the lab manual to complete in your lab notebook the following sections of the report for this lab exercise: Title, Lab Purpose, Procedure and Data Tables. 3 Determination of COD of waste water. … Discussion and Conclusion: Through titrating an unknown weak acid with a known strong base, NaOH, and following the subsequent changes in pH, we were able to determine the K a of the unknown weak acid being titrated. above pH 7.00 In the titration of 10.00mL of an unknown weak acid with a strong base that has a molarity of 0.1002M, the equivalence volume was found to be 19.20mL. Introduction Acids differ considerable as to their … ? Determination of Ka of a Weak Acid INTRODUCTION The purpose of this experiment was to use titration techniques to determine the Ka of an unknown weak acid. L>%0v�E�*��0�TD�OFsU��?��1�����y�w��Ӿ�PpT�O'� In addition, students will determine the effect of initial concentration on the dissociation constant. %��������� The strength of an acid is measured based on its ability to donate protons to base. n�~��hH�]����{�͵�����O鍘������)��I,7_?��Ƽ����Oa�mM���R��|���b1lӛ뿘� �‘Ch�؋X.q�n[i9р3N:H"a�)�2�f��E��ň\ ���[� �~>u�@C�7��"̽꤃� Florida International University. stream ...The Ka and Molar Mass of a Monoprotic Weak Acid Chemistry Lab 152 Professor: James Giles November 7, 2012 Abstract: The purpose of this experiment was to determine the pKa, Ka, and molar mass of an unknown acid (#14). stream Safety and Waste Disposal Handle Acetic acid with care, it can cause painful burns if it comes into contact with the skin Sodium hydroxide solution is caustic, avoid spilling it on your skin and. Biological Chemistry (CHM 5305) Uploaded by. complete in your lab notebook the following sections of the report for this lab exercise: Title, Lab Purpose, Procedure and Data Tables. 1. Sample Mass 0.30g Initial reading 0.10 ml Initial reading 0.00 ml Final reading 25.00 ml Final reading 3.00 ml Volume of Titrant _____ ml Volume of Titrant _____ ml Answer: _____ 2. rachel tammone chm113 section heather pedziwiatr determination of ka: titration of weak acid purpose: the purpose of this lab is to determine the acid %�쏢 Determination of Ka of Unknown Weak Acid. << /Length 5 0 R /Filter /FlateDecode >> Ka of Unknown Acid Pre-Lab 1. The Ka and Molar Mass of a Monoprotic Weak Acid Chemistry Lab 152 Professor: James Giles November 7, 2012 Abstract: The purpose of this experiment was to determine the pKa, Ka, and molar mass of an unknown acid (#14). In this lab, the student will determination the acid dissociation constant, K a, for three weak acids. Equilibrium of a reaction is the state of when the forward reactant equals the rate of the backwards reaction. 4 0 obj Procedure: Be sure to wear your virtual goggles when working with in the virtual lab! ... of an unknown acid. Use the following data from a titration calculate what mass of acid would be needed to completely react with 9.50 ml of titrant, if the molarity of base was 0.10 M of NaOH. This is also true of acid-base reactions. ��J�L��x�� �_%9x8Dp�? If a weak acid is titrated with a strong base, will the equivalence point in the titration occur below pH 7.00, at pH 7.00, or above pH 7.00? !�H�F7�ҽ�j��]��1D}/!͔B�Jp~�bT��al�)>�C֩��8�W3�������X#T��#�����}��ǐ�{�x�ZM1g�(��.��A'��Q@(�!�����*�3��`�yDp��J�^�@��&���IB��8����ş����)���0�7L��B����X��|������A�Xak]��r���U�O{&V a��PB���EMEi��Ր7�y�y@��?�>�Py\��¥c:��?�Mw��^#�NH�;fM�ap0NtM:-������GO���{/�>�>���P�魧5�f�s�"!\�� B3;��^��Ӂ�/V$ n�!����W��KYἻ9K�ϖ8�\��R{1�Cr�6��ϒo�"CH|ű��x�B�XCq^W|=��{T��a入��;1�"n 2. The melting point of the solid acid will be found using a Meltemp. The acid ionization constant, Ka, is a quantitative measure of the strength of an acid. Lab 5 - Characterization of an Unknown Acid Goal and Overview The titration curve of an unknown weak acid with a strong base will be measured using a pH meter. In this lab, the student will determination the acid dissociation constant, K a, for three weak acids. The first way was by measurement of the pH of a solution containing a known concentration of a weak acid. In any titration experiment, an accurately known number of moles To determine the nature of your compound: Dissolve a small amount of your unknown in water. University. 8 0 obj �uYz ���N�Շ����W��˴�Rn. 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