CHEM 110 Lecture Notes - Lecture 4: Ideal Gas Law, Sodium Nitrate, Gas Constant
11 May 2018
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Experiment A4: The Determination of the Universal Gas Constant
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Introduction and Purpose:
In this experiment, an apparatus is used to determine the ideal gas law constant R for the reaction
of a known amount of sulfamic acid with excess sodium nitrate producing a yield of nitrogen gas.
Applying stoichiometric calculations, the quantitative yield of nitrogen can be used to determine
the value of all the variables in the reaction. The constant R can be calculated by calculating the
partial pressure of the nitrogen gas produced and measuring the temperature as well as air pressure.
The purpose of this experiment is to prepare a solution of known concentration and to use
quantitative analysis to interpret results and collect a gas over water. In this lab, we will be able to
apply the universal gas equation in conjunction with stoichiometric calculations to find the value
of the constant R in the Ideal Gas Law. The constant R is found for a known amount of sulfamic
acid with excess sodium nitrate, listed: HSO3NH2(aq) + NaNO2(aq) → N2(g) + H2O(l) + NaHSO4(aq).
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Calculations:
Equation 1: PTot = PN2 + PH2O + PCol
Equation 2: PV = nRT
PTot is the atmospheric pressure, PN2 is the pressure of Nitrogen, PH2O is the pressure of water and
PCol is the pressure due to the column of water in the burette. All of the pressure calculations
were measured in kpa.
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Document Summary
Experiment a4: the determination of the universal gas constant. In this experiment, an apparatus is used to determine the ideal gas law constant r for the reaction of a known amount of sulfamic acid with excess sodium nitrate producing a yield of nitrogen gas. Applying stoichiometric calculations, the quantitative yield of nitrogen can be used to determine the value of all the variables in the reaction. The constant r can be calculated by calculating the partial pressure of the nitrogen gas produced and measuring the temperature as well as air pressure. The purpose of this experiment is to prepare a solution of known concentration and to use quantitative analysis to interpret results and collect a gas over water. In this lab, we will be able to apply the universal gas equation in conjunction with stoichiometric calculations to find the value of the constant r in the ideal gas law.
