The flask shown here contains 10.0 mL of HCl and a few drops of phenolphthalein

Question

The flask shown here contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.240 M NaOH. a) What volume of NaOH is needed to reach the end point of the titration? b) What was the initial concentration of HCl?

Explanation / Answer

M1 x V1 = M2 x V2 =>M1 x 10.0 = 0.220 x V2 =>V2 (volume of NaOH) = M1 x 10.0 / 0.220 =>M1 (initial concentration of HCl) = 0.220 x V2 / 10.0 you can calculate the unknows from the above equations BUT you need to know one unknown to solve for the second.............. bifercating steps....... RATE ONLY TO ONE PERSON.. THANKING YOU. LIFESAVER...:)

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