QUESTION 1 2 points Save Answer The four chemistry friends Kemmi, Doc, Stu, and

Question

QUESTION 1 2 points Save Answer The four chemistry friends Kemmi, Doc, Stu, and Noke determine the acetic acid concentration in apple cider vinegar using titration with sodium hydroxide according to the procedure described in Lab 2 of this Module Stu Dent performs two separate titration reactions. Use Stu's data (given below) to help him perform each step of the calculations over the next seven questions Volume of each apple cider vinegar sample: 25.00 mL (measured with a 25 ml. volumetric pipet) Concentration of NaOH: 0.6939 mo/L (as standardized by the four friends in the previous question set) Indicator: phenolphthalein First titration buret readings for NaOH volume: initial 0.00 ml, final 24.98 ml Second titration buret readings for NaOH volume: initial 15.15 mL, final 40.03 mL Caloulate the volume of NaOH solution used in each titration. Answer to 2 decimal places with units of ml. Titration 1: Titration 2 QUESTION 2 1 points Save Answer When the acid sample is a solution, and the same acid volume is pipetted for each titration, then the "+0.15 mL. test" can be applied to the NaOH volumes to estimate the relative accuracy of the titration results. Do Stu's two titrations meet the ":0.15 mL test" criteria? In other words, are the two titrations accurate within the definition of the test? Yes No QUESTION 3 2 points Save Answer Calculate the moles of NaOH reacted in each titration using the NaOH concentration and each NaOl voluse. Answer to 4 significant figures, with units of mol Titration 1 Titration 2

Explanation / Answer

Question 1

Volume of NaOH use in titration 1 = 24.98 ml

Volume of NaOH used in titration 22 = 40.03 -15.15 = 24.88 ml

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