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16 Nov 2019
Question 5 0 out of 4 points Stu Dent has finished his titration, and he comes to you for help with the calculations. He tells you that 20.00 mL of unknown concentration HBrfaq) required 18.45 mL of 0.3500 M NaOH(aq) to neutralize it, to the point where thymol blue indicator changed from pale yellow to very pale blue. Calculate the concentration (molarity) of Stu's HBr(aq) sample. (4 significant digits, units M) Selected Answer: 0.3228 Response Use the data for the NaOH to calculate the number of moles of NaOH. Use the acid-base mole ratio to determine the moles of HBr. Divide the moles HBr by the volume in liters to find the molarity Feedback: Question 6 0 out of 4 points Kemmi Major also does a titration. She measures 25.00 mL of unknown concentration H2SO4(aq) and titrates it with 0.1000 M NaOH(aq). When she has added 42.18 mL of the base, her phenolphthalein indicator turns light pink. What is the concentration (molarity) of Kemmi's H2SO4(aq) sample? (4 significant digits, units M) Selected Answer: 0.16872 Response Use the data for the NaOH to calculate the number of moles of NaOH. Use the acid-base mole ratio to determine the moles of H2S04. (Hint -is the mole ratio 1:1?) Feedback: Divide the moles H2S04 by the volume in liters to find the molarity.
Question 5 0 out of 4 points Stu Dent has finished his titration, and he comes to you for help with the calculations. He tells you that 20.00 mL of unknown concentration HBrfaq) required 18.45 mL of 0.3500 M NaOH(aq) to neutralize it, to the point where thymol blue indicator changed from pale yellow to very pale blue. Calculate the concentration (molarity) of Stu's HBr(aq) sample. (4 significant digits, units M) Selected Answer: 0.3228 Response Use the data for the NaOH to calculate the number of moles of NaOH. Use the acid-base mole ratio to determine the moles of HBr. Divide the moles HBr by the volume in liters to find the molarity Feedback: Question 6 0 out of 4 points Kemmi Major also does a titration. She measures 25.00 mL of unknown concentration H2SO4(aq) and titrates it with 0.1000 M NaOH(aq). When she has added 42.18 mL of the base, her phenolphthalein indicator turns light pink. What is the concentration (molarity) of Kemmi's H2SO4(aq) sample? (4 significant digits, units M) Selected Answer: 0.16872 Response Use the data for the NaOH to calculate the number of moles of NaOH. Use the acid-base mole ratio to determine the moles of H2S04. (Hint -is the mole ratio 1:1?) Feedback: Divide the moles H2S04 by the volume in liters to find the molarity.
Bunny GreenfelderLv2
13 Aug 2019