anyons- CHEM 201-Spring18-MCMAHON Activities and Due Dates HW4 3/25/2018 11:59 P
ID: 1025650 • Letter: A
Question
anyons- CHEM 201-Spring18-MCMAHON Activities and Due Dates HW4 3/25/2018 11:59 PM 0 84/103/9/2018 11:21 AM Print alalator Penodic Table estion 23 of 25 Sapling Learning The flask shown here contains 10 0 mL of HCI and a few of phenolphthalein indicator. The buret contains 0.170 M Na mL 10 What volume of NaOH is needed to reach the end point of the titration? 15 Number 30 mL NaOH 35 What was the initial concentration of HC1? Click to begin Number M HCI Previous Give Up & View Solation Check AnswerNextE Hint us careers privacy policy terms of use contact us helpExplanation / Answer
Click on the buret to add NaOH to the HCl, the end-point will appear when the solution in flask will turn into
faint pink, you can stop the titration at this very point by clicking on it again and note this end-point.
[ i.e) this is your volume of the NaOH needed to reach end-point of titration ] Remember the reading
should be done from top to bottom.
M1 = Initial conc of HCl in mol/L ; V1 = volume of HCl = 10mL = 10/1000mL = 0.01 L
M2 = Conc of NaOH = 0.170 mol/L or M ; V2 = volume of the NaOH needed to reach end-point of titration in L
[ convert V2 from mL to L by dividing mL value with 1000 ]
M1* V1 = M2 * V2
M1 = ( M2 * V2 / V1) = Initial conc of HCl in mol/L or M
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