# Chemistry

A buret is partially filled with NaOH solution, to a volume of 1.14mL. A 20-mL sample of 0.1011 M HCl is titrated to a faint pink phenolphthalein endpoint. The final buret buret reading is 22.37mL. What is the molarity of the NaOH solution? Please help. Thank you in advance.

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1. NaOH + HCl ==> NaCl + H2O
mols HCl = M x L = ?
Since the equation shows 1 mol NaOH = 1 mol HCl then mols NaOH = mols HCl.
Then M NaOH = mols NaOH/L NaOH.
You know mols NaOH and you know L NaOH. The only complicating factor is that the buret was not full for the titration. mL NaOH added = 22.37-1.14 = ? Convert that to L and substitute into the above. Solve for M NaOH.

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2. Great! Thank you. This helps a lot!

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3. penn sate

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posted by john

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