[Ranpanlew]

I completed a simple acid/base titration.  Here is the method:
1. Added 8.5 mL of HCl to 1 L deionized H2O, making a ~ 0.1M HCl solution.
2. Pipetted 25mL of the ~ 0.1M HCl solution into a clean 250 mL Erlenmeyer flask.
3. THEN I should have added 100 mL of deionized water to the flask - which I forgot to do.
4. Added 2 drops of phenolphthalein indicator solution to the E. flask & titrated it with an NaOH solution.

I titrated an average volume of about 5.7mL of the NaOH to get it to react with all the HCl (& turn the indicator pink). 

Will M1V1=M2V2 still work to obtain the correct concentration of of the HCl solution even though I forgot to dilute it with 100mL of D H2O?

[mallesh.jubburu]

Hi,

dilution with water is only purpose of Titrand or analyte reacts with Titrant with out any loss , and here water did not reacts with sodium hydroxide(Titrant), only HCl reacts with sodium hydroxide.