Jump to... Question 16 of 22 Availabl Due Dat Points P Grade Ca Sapling Learning

Question

Jump to... Question 16 of 22 Availabl Due Dat Points P Grade Ca Sapling Learning The flask shown here contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.270 M Na mL Descript What volume of NaOH is needed to reach the end point of the titration? 10 15 Policies: You can You can give up You can until you You lose Number 25 mL NaOH - 45 What was the initial concentration of HCI? Click to begin Number attempt M HCI D eTextbe O Help W O Web He O Technica O Previo us G ve Up & View Solution e Check Answer () Next Exit Hint about us.E.. careers... privacy policy..|.. terms otuse- contactus hel

Explanation / Answer

1)

here the indicator changes the color when 16 mL of NaOH is added .

The volume of NaOH needed = 16 mL

2)

mmoles of NaOH = millimoles of HCl

mmoles of NaOH = 16 x 0.270 = 4.32

mmoles of HCl = 4.32

10 x M = 4.32

M = 0.432

initial concentration of HCl = 0.432 M

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