www.saplinglearning.co xC Chegs Study Guided S x What is the hydrogen lo x ning.

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www.saplinglearning.co xC Chegs Study Guided S x What is the hydrogen lo x ning.com/ibiscms/mod/ibis/view.php?id-1925069 &Print; CalouatorPeriodic Table Question 25 of 29 The flask shown here contains 10.0 mL of HCI and a few of of phenolphthalein indicator. The buret contains 0.310 M What volume of NaOH is needed to reach the end point of the titration? mL 0 Number mL. NaOH 35 What was the initial concentration of HCr? Number M HCI OPwveus Gvt up & Vin* Sosten Ch.ck AnswerNot Ext about us carees partners privaty pelicy of use contact s help

Explanation / Answer

For titration,

moles of NaOH = moles of HCl

Since the only data available here is volume of HCl and molarity of NaOH

with the assumption of volume of solution to be 10 ml = 0.01 L

moles [NaOH] = molarity x volume = 0.310 x 0.01 = 3.1 x 10^-3 mols

thus molar concentration of HCl = moles/L = 3.1 x 10^-3/0.01 = 0.31 M

and, volume of NaOH needed = 0.01 L = 10 ml

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