1 peints Save Answer Select the glassware items necessary for accurate volume me
ID: 550676 • Letter: 1
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1 peints Save Answer Select the glassware items necessary for accurate volume measurements in an extremely accurate titration experiment. Buret to messure the bane Beaker to measure the base Volumetric pipet to measure the base. measure t the acid OVolumetrie pipet to measure the acid Buret to measure the acid What is the minimum number of titrations needed to calculate a reliable average concentration, assuming all the titrations meet the 0.15 mL test for the volumes of base read from the buret? QUESTION 3 2 points Save Answer Noke Lew is struggling with her first titration. She says the NaOH(aq) in the buret started at 2.05 mL and finished at 24.30 mL when the indicator changed color. Help Noke determine the NaOH(aq) volume added to the reaction. (4 significant digits, units mL) 1 points Save Answer Noke is still struggling on her second titration. She says the NaOH(aq) in the buret started at 3.50 mL and now it is at 47.00 mL but the reaction hasn't changed color yet! What chemical did Noke probably forget? She forgot to add the acid She forgat to add the bae O She forgot to add the indicato QUESTION 5 points Save Answer 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 HBr(aq) 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 HBrfaq) sample. (4 significant digits, units M)Explanation / Answer
1) burette to measure base
2) 3
3) volume of base added = final reading - initial reading = 24.30 -2.05 = 22.25 mL
4) she forgot to add indicator
5)
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