Reagent Observation ShStress How did the reagent cause that stress? ah Pinck Wea
ID: 543600 • Letter: R
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Reagent Observation ShStress How did the reagent cause that stress? ah Pinck Weak acids produce a few hydrogen ions in solution. Acetic acid is an example of a weak acid which produces hydrogen ions and establishes the following equilibrium CH3COOH + H2O H30' + CH3COO. Methyl orange will be used as the indicator for this reaction. Methyl orange is red in very, v acidic solutions, yellow in slightly acidic solutions, and orange in between. Remember that greater acidity means that more hydrogen ions are present at equilibrium. In each of two test tubes place 2 -3 mL of 0.10 M CH COOH and 2 drops of methy orange solution. One of these samples in your "control". To the other test tube add I M NaCHsCOO dropwise, while shaking the test tube to mix, until you see a color chang Reagent Observation Shift Stress How did the reagent cause that stress? NaCH3COo Red loange Part D: Solubility Equilibria The compounds that are classified as "insoluble" will actually produce a few ions in aqueous solution. Solid calcium oxide combines with water to form calcium hydroxide which establishes the following equilibrium: Ca(OH)x(s) Ca2(aq) 2 OH (aq) Place about 0.01 grams of calcium oxide, CaO, into each of three test tubes. Add about 3 mL of d.i. water to each test tube and stopper and shake vigorously for I minute each. A cloudy mixture should be attained, indicating that a precipitate is present. To one test tube add 6 M HCI dropwise, shaking the test tube to mix, until you see a change. To the second test tube add 0.2M Na EDTA dropwise until you see a change. EDTA forms a soluble complex ion with many metal ions. To the third test tube, add 6 M NaOH dropwise until you see a change. Reagent Observation Shift Stress How did the reagent cause that stress?Explanation / Answer
By adding reagent NaCH3COO it will dissociate into Na+ and CH3COO- thereby increasing
the concentration of CH3COO- which is in products side of the equation
CH3COOH + H2O <------> H3O+ + CH3COO-
So the stress is on right side i.e) products side. Therefore the system shifts to left direction
i.e) towards reactants side.
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