1. Phenolphthalein, Ka= 7.9x10^-12,is yellow in its protonated form (HX) and red
ID: 627191 • Letter: 1
Question
1. Phenolphthalein, Ka= 7.9x10^-12,is yellow in its protonated form (HX) and red in its ionized form (X-). At what pH will alizarin yellow R be a perfect orange color? Express your answer to one decimal place. 2. Open the simulation and test the pH of a series of acids and bases at 0.1 M. Which of the following could be the pH paper for a test involving a strong base. a. red b. blue c. orange d. green 3. Use the simulation to test the pH of a 0.1 M solution of methylamine, NH2(CH3), dimethylamine, NH(CH3), and trimethylamine,N(CH3) . Given the trend in pH for this series, rank the bases in the set below. rank from strongest to weakest: methylamine, trimethylamine, dimethylamine, sodium hydroxide 4. Use the data in the simulation to find the Ka value of HOAc, acetic acid. Express your answer to two significant figures.Explanation / Answer
number 2 is blue
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