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The flask shown here contains 10.0 mL of HCI and a few drops of phenolphthalein indicator. The buret contains 0.170 M NaOH mL 10 at volume of NaOH is needed to reach the en 20 25 30 E 35 40 E- 45 Number mL NaOH What was the initial concentration of HCI? Click to begin Number M HC

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Answer #1

The reaction between NaOH and HCl is given by

NaOH(aq) + HCl(aq) -----> NaCl(aq) + H2O(l)

1mole NaOH = 1mole HCl

Thus 10mL of HCl requires 10mL of NaOH solution for neutralization

The concentration of HCl is given by

MHCl.VHCl = MNaOH.VNaOH

MHCl*10.0mL = 0.170 M*10.0 mL

MHCl = 0.170 M

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