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Question

The flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.300 M NaOH. It requires 16.7 mL of the NaOH solution to reach the end point of the titration.

What is the initial concentration of ?

Answer 1

1 l of NaOH contains 0.3 moles

16.7 ml = 16.7 / 1000 l = 0.0167 l

So we have 0.0167 x 0.3 moles of NaOH used

HCl + NaOH = NaCl + H2O so we also need 0.0167 x 0.3 moles of HCl , in 10 ml (10/1000 = 0.01 l)

So molarity of HCl is (0.0167 x 0.3) x (1 / 0.01)

Answer 2

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