Homework Help: Chem

Posted by debbie on Tuesday, July 13, 2010 at 5:09pm.

a solution of sodium hydroxide is standardized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.054 g; buret reading before tiltration 0.33 mL; buret reading after tiltration 36.37 mL.

Answer in units of M.

Chem - DrBob222, Tuesday, July 13, 2010 at 5:41pm
moles KHP = grams/molar mass.
moles NaOH = moles KHP (write the equation to see that it is a 1:1 ratio).
M NaOH = moles NaOH/L.
Yo will need to subtract the final buret reading from the initial buret reading to obtain the total mL NaOH used, then convert to L to substitute into M = mols/L.

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