# gas laws pre lab

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Pour all the contents of the large test tube into the labeled zinc chloride waste container in the hood. A gas will act like an ideal gas if its gas molecules are small, when the pressure is low, and the temperature is high. What type of suggestion do you have? <<1207F8EE7237A84198C33CEC90FAF33E>]>> Finally determine the percent purity of the zinc sample by dividing the mass of zinc reacted by the mass of the impure sample and multiplying by 100%. These questions were posed in a lab done at Collin College. 0% found this document useful, Mark this document as useful, 0% found this document not useful, Mark this document as not useful, Save Gas Laws Prelab Questions for Chemistry I For Later. Calculate the molar mass of the unknown: 3. Feedback . $n_1 = \frac{4.00g}{4.00g/mol} = \text{1 mol}$, $=\frac{2 mol \centerdot 500mL}{1 mol}$. Determine the percent purity of zinc sample combining the ideal gas law with stoichiometry. 2. [ "article:topic", "fundamental", "showtoc:no" ], Olander, Donald R. "Chapter2 Equation of State. The volume of hydrogen gas produced is the difference between the final and initial burette readings. 0000007391 00000 n Calculate the percent error in the molar mass of your unknown based on this substance. Obtain a piece of aluminum foil and rubber band to serve as a cover for the experiment (but do not attach yet. Your first days are free! (It is important that no air bubbles remain in the tubing or funnel stem at the beginning of the experiment.)

However, you need to convert grams of Helium gas into moles. Record the final burette reading in your DATA TABLE. Ŧ����s�"Al�3�;;��� Zn����� The collisions between the ideal gas particles are said to be elastic, they exert no attractive or repulsive forces. Determination of the Gas Law Constant. xref 0000004686 00000 n Place the large test tubes in the tray and the small test tubes in a 400 mL beaker found next to the oven. Always read your volume measure from the top down. Materials Ideal Gas Law Lab 1. LAB Report 10 - Determination of the Gas Law Constant. Vapor Pressure of Water at different Temperatures, (Students should work in pairs for this experiment.). After all the hydrogen gas has evolved, the level of water in the burette will remain constant. Wash all the test tubes with soap and water followed by rinsing with distilled water. ��]v Measure the temperature of the water in the funnel using a thermometer. Have questions or comments? L�1Ks=�н�;%nB�2l�6u��h���$/��O)��W���w����S��� h�_� Compliment Problem Suggestion Other. Feedback Category. If you are not sure about what you should do, please consult your instructor before you proceed to the next step. Use a graduated cylinder to fill the flask with water. University. Average Molar Mass of unknown ___________________. Record the volume of water in the burette to the nearest 0.01 mL as your initial burette reading in the DATA TABLE. To solve this question you need to use Boyle's Law: Keeping the key variables in mind, temperature and the amount of gas is constant and therefore can be put aside, the only ones necessary are: Plugging these values into the equation you get: To solve this question you need to use Charles's Law: Once again keep the key variables in mind. �Dc$H��R��ل-.� 0�5c��9���%'�"?8i{��O����m�JU 0000006395 00000 n

What were some sources of error in your experiment and how did they affect your measurements? 0000004807 00000 n mol-1. Gram of Zn reacted = _____ mol H2 x  = _____ g Zn                          Equation 6. x�bbRbŃ3� ���ţ�1�1@� �A� Explain. Determine the molar mass from separate trials.

Give the units for each variable. U���j�B�% T�����j���~x���=�~��K�MW]۶j��z�-�}�g� �We��s=�K�}Y�gE�P�?���������#���-���X��d��y�G���Q\���V�ЈF=:�F]�,Y؀T��&�[�o�j��+�9�[t�Pw!tu�WB����K�5��}׍j�J�;ыamZ����/�������E������|�!�=�U�_��#>�. How? 0000005569 00000 n Helpful?

To determine whether this relationship holds for a mixture of gases, the pressure of Clamp a thermometer to the ring stand to measure the temperature in the middle of the solution. H��SɊ�0��)�� cE�w9$J�"zIK�����K����To�Z����O�&��<2��y����������j����Y0�� +l�qB��W�!��X��౟7�9 �ƘTX^�i�Hh����.ޕmm�A�'��6��M�O�����adֹ�~��9��w�ӛ��SM�ÆදF{:�@�k�L�4�;�i�e.xo^�r/rT�\�J((d[{���s J�A�Bj��, (2 pts. An ideal gas follows the ideal gas law at all conditions of P and T. The particles in an ideal gas do not have finite size and volume. 0000008772 00000 n H�TP=o� ��+��-��&�΁I�@����^����g?���K�l���1��NG���G�q�V�ը&�dq�� ��mې�L�)�p7�z�5j�֍9s��9�/!|�.! Water temperature = 22.1 degrees Celsius Barometic Pressure = 763.9 mm Hg Volume of air (before) = 30mL Volume of air (after) = 68mL Rate of change = 38mL 2. Wipe the outside of the flask to completely remove water being especially careful about drying the top edges. 1. if you weighed 0.50 g of an unknown metal and reacted it with acid as in this experiment to get 188.33 mL of hydrogen gas with an atmospheric pressure of 759 torr and a temperature of 20.2 deg C, what is the atomic mass of the unknown divalent metal and what is the metal? Explain the following laws: Boyle, Charles, Gay-Lussac. (Hint: Avogadro's Law), www.chem.queensu.ca/people/faculty/mombourquette/firstyrchem/GasLaws/index.htm. Topics In Chemistry (SCC 101) Academic year. This portion of the procedure must be carried out by you and your partner in a coordinated manner. 0000008029 00000 n For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. 0000000934 00000 n A laboratory group measures an excess of an unknown liquid. endstream endobj 488 0 obj<> endobj 489 0 obj<> endobj 490 0 obj<>stream 0000001354 00000 n Adjust the height of the funnel so that the level of water in the funnel is at the same height as the level of water in the burette. Raise and lower the funnel to help expel any air bubbles. Add about 2.0 mL of 6.0 M HCl into a small test tube (70 mm x 10 mm). H�l��n�0E���YR@M�����,Z4@D�����鈭,"c'�!%Y�h�y�̝2��(�� �O'"��G��s� �Y)������u�~���e(�~�H�;�q�0� �I�^�5���y It involves the measurement of the volume of hydrogen gas generated from a reaction of zinc with excess hydrochloric acid. Record the temperature to one decimal place in the DATA TABLE. Record the mass of the zinc in your DATA TABLE. Based on the molar mass you calculated for your unknown, what possible unknown (listed in Table 1) did you have? To determine the pressure of hydrogen gas alone, you will need to use Dalton’s Law of Partial Pressures. -Boyle: VP=k (If pressure increases, volume decreases and vice versa at a constant temperature) -Charles: V/T = k (if temperature increases, volume increases at a constant pressure) -Gay-Lussac: P/T = k (if temperature increases, pressure increases if the volume is constant) Dutch physicist Johannes Van Der Waals developed an equation for describing the deviation of real gases from the ideal gas. The volume collected can then be used to calculate the moles of hydrogen produced by using the ideal gas law. %PDF-1.4 %���� Register now! Clean the bench top with a moist paper towel. The pressure remained constant and since the amount of gas is not mentioned, we assume it remains constant. w�A�v�~l�ґ���ܱ��6K{�oU�l�q�ZA�ct_�/ݮ4����.��cP����:�wI��)�H������=�ء���G��~\�j��z����2�YLb�.{����`3\�����(���^:���]�{��J�(��H=��I,�9[��ق? 0000004730 00000 n 0000005951 00000 n The ideal gas has constant, random and straight-line motion. Leave the wet test tubes in a tray next to the oven. The student responsible for lowering the funnel must do so, when necessary, after the HCl and zinc have been mixed so that the level of water in the funnel is at the same height as the level of water in the burette. LaGuardia Community College. 0000001542 00000 n This results in a gas sample that is a mixture of hydrogen gas and water vapor inside the buret. constant divided by constant pressure, V/T = nR/P. 474 0 obj <> endobj 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. 1. ;� n�c������-$��S����.

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