H 2SO 4 (aq) + HPO 4 2– (aq) ! <> WORKSHEET 8 (NOTES) The pH of a WEAK acid solution Calculate the pH of a 0.500 M aqueous solution of formic acid, HCOOH [K a =1.77 x 10-4] Step 1 List the major species in the solution. For this type of question you have to know the approximate pKa values discussed in class and have an idea of what they mean in terms of relative acid strength and also relative base strength. [ "article:topic", "fundamental", "worksheet", "showtoc:no" ], Introduction to Thermochemistry (Worksheet). You should try to answer the questions without referring to your textbook. Complete the following table by checking off with an x which of the missing values including those in the equilibrium constant expression can be calculated in each case? Starting from ten de-ionized molecules, develop a model of a solution that is 10% ionized. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. Missed the LibreFest? Determine the percentage dissociation of each of the following weak acid solutions. %���� Acids and bases vary in strength. Is the equilibrium static or dynamic? <> How does the autoionization of water affect the hydrogen ion concentration of a strong acid solution? OH- and H2O make the other. 4 0 obj Draw a series of illustrations that show what occurs at the particulate level (a) before solid sodium acetate and water are combined, (b) just after the sodium acetate is added to the water, and (c) after the solution comes to equilibrium. If you get stuck, try asking another group for help. Write the formula, plug numbers into formula, & give answer with correct units and significant figures. 2 0 obj $t� ��v�I�. Sulfurous acid H 2 SO 3 6. a) What is the ratio of weak acid molecules to water molecules in a 0.10 M solution? Model a weak acid solution that is 40% ionized. @*�Ba�J` ��Fd�JJE8SQs�9^���+ᥬH�7b��;E]ff���wf���NŌwj)�E��YrU�aY�U�� [�cn.&_�Ԣ���t�P��X-�xa`4�ÇO��.k�U;_��$h�e+RX]"a' ?���0(�k ��� �`�#���n���Q� H��,���ո~c�og+b�H�������:Px�:t7�c��^�� ��gA[,������|�)p ���l���"��%;*(��mi���%BL�E�0q.�E��"�_zX i��+,�ݤ}�a�7�Q��MI�*����2�$4��EE�+�N����YM�"� ���0+cj�e��|��1��"�0�gMX�lwb!t�]��:� '��l�Z�����~b$�) V��3�8@�Z1N������҄p��O[H�X�ٖ1�e�� Some of the worksheets below are Acids and Bases Worksheet Middle School : Acid vs. Base Characteristics, Bronsted Acids and Bases, Identify Conjugate Acid/Base, Acids, Bases, and Conjugates : Recognizing Strong versus Weak Acids, Relationships between pH and pOH, … Let the penny be the ionizable hydrogen ion and the quarter be the conjugate base. 2 0 obj <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 4. stream 8. Hydrochloric acid HCl 8. a) A 1.0 M solution of a weak acid with Ka = 5.0 x 10–5 d) What is the pH of HCl solutions of the following concentrations: 10–3 M, 10–6 M, 10–10 M? ; Differences in strength relate to the proportion of ions formed. �C��9I3���c���9}��a^�kLFk%� y���0:�:y�-�l���tV���5yB���t���=ѥ���N�u�`�����������4($sÜ�_�qW�6 �2k�'�\l�N�Z��ҷ�߶+~V���@�N�W:��O�l�f����K�*��4���8��.H��*L��y�х�n�%0�S��O�Fd] \oњj�b]X�z#(�`�]X�7,ȉS(�`G�24b����.�^O1���.� �B���x2e�ΡΎ!+��Q3��Op��\o>�m��-Ep�)~���w�`�Y~�O�&��������G8fsr�����8'! a. ♦ Acids react with bases to produce a _____ and water. 6. Write the equilibrium reaction and outline the respective mathematical process that you would use use to find the pH of each of the following aqueous solutions. <>>> ; When a strong acid or base dissolves in water, all of the molecules form ions. 6. Acids & Bases Calculations Practice Worksheet Directions: Solve the following pH calculations. The following table includes some common acids and bases. �=���Mag��`��M;�ղ�ɀ�(nVX�q�2�Q�|L^%}�mU��fz�&�K� m��NI��m��)�M$� 5. (Acids/Bases) are also commonly used to produce soaps and have a (bitter/sour) taste. stream Explain. Chlorous acid HClO 2 7. This is formed by dissolving carbon dioxide in water. Phosphoric acid H 3 PO 4 9. Ignore water molecules in this exercise. ♦ Acids react with some metals to produce _____ gas. If the pH of a solution is 10.3, what is the [H+] concentration? << /Length 4 0 R /Filter /FlateDecode >> ♦ Because aqueous acid solutions conduct electricity, they are identified as _____. a. The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. (a) Milk of magnesia (b) gastric juice in humans (c) soft drinks (d) lime water (e) vinegar (f) soap 2. Nitric acid HNO 3 2. :l����N�M. 1 0 obj endobj Determine the value of the acid equilibrium constant for each case. Acetic acid HC 2 H 3 O 2 4. Chloric acid HClO 3 3. Work in groups on these problems. 3719 Acids and Bases Worksheet – Answers 1. Seltzer water and all sodas contain a very mild (acid/base) known as _____. c) How does the autoionization of water affect the hydrogen ion concentration of a weak acid solution? %��������� the initial acid concentration, also from experimentation. Without making any simplifying assumptions, determine the [H3O+] and pH of a 0.0010 M weak acid solution with Ka = 9.5 x 10–5. (Hints: Assume a typical weak acid has a Ka of about 10–5. Determine the answer mathematically. b) CH3NH2 + H2O ( CH3NH3+ + OH-1 Hydrobromic acid HBr 5. ♦ Acids turn _____ different colors. Legal. Nitrous acid HNO 2 10. x��]]���q}�_��Qe ��,��T&��)W�T�)Q�D$�]Ѷ���b�̜���{W��kz��LO��>�=?7_7?7�Ѽ5�st�mU�6��7i�7�?�͛����{�=�[��J����K�dN�Br�U��r͹n޼k�x٘��㏗�Ͽ-oD��m��/>i^���w�g�/=���dHux���/Ǒ�#L View acid-Base Worksheet 2.pdf from CHEM 1100 at University of the West Indies at Cave Hill. HNO3 and NO3-1 make one pair OH-1 and H2O make the other. }��W��?���˻�_߯w�s���o~������?ݿ\��ܛ����_ڻ�������7���Ϸ���}��Ι���6h��e�l����~��xݦ�^�u�������V�_U�o��jZLhd�}�� #�����on?�}so�n��/~(���ݿ\��,���x��������o��ƹ��͝�~y����=���k�����K����+�9�Y��m��/>ڏiQ궚uڶۢ�R�L���7/>��/n? Identify the conjugate acid-base pairs in the reaction. … %PDF-1.3 Some of the worksheets for this concept are Chapter 14 acids bases work, Chapter 19 acids bases work answers, Solutions acids and bases work answers, Chemistry acids and bases work answers, Chapter 19 acids bases salts work, Notes acids bases and salts, Solutions acids and bases work, North paul … Acid and Base Worksheet 1) Using your knowledge of the Brønsted-Lowry theory of acids and bases, write How accurate does a pH calculation need to be? Complete the table, using your textbook as a reference. Acid Nomenclature Worksheet KEY Write the formula for each of the acids listed below: 1. Put the following substances in acid or base bottle. Without making any simplifying assumptions, determine the [H 3 O +] and pH of a 0.0010 M weak acid solution with K a = 9.5 x 10 –5. ^i����/鈍o����G�G����8��tD�Y�GX�a��.yH�8�t����~��F���.��/�#�8��'l9���� For this type of question you have to know the approximate pKa values discussed in class and have an idea of what they mean in terms of relative acid strength and also relative base strength. endobj Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. �t 7t0Q͗��u-� ��Nj;����N:����DX��t�?z|���}����Y�6�A ��t BASES: What is the relationship between concentration and percentage dissociation for a given weak acid?

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