Homework Help: NEED HELP WITH CHEMISTRY HW

Posted by Anonymous on Saturday, October 1, 2011 at 7:50pm.

Ascorbic acid (vitamin C) is a diprotic acid having the formula H2C6H6O6. A sample of a vitamin supplement was analyzed by titrating a 0.2894 g sample dissolved in water with 0.0215 M NaOH. A volume of 10.83 mL of the base was required to completely neutralize the ascorbic acid. What was the percentage by mass of ascorbic acid in the sample?

______________% ascorbic acid

NEED HELP WITH CHEMISTRY HW - DrBob222, Saturday, October 1, 2011 at 11:34pm
1. Write the equation and balance it.
2. moles NaOH = M x L = ?
3. Using the coefficients in the balanced equation, convert moles NaOH to moles ascorbic acid.
4. moles asc acid x molar mass asc acid = grams ascorbic acid.
5. %ascorbic acid = (grams ascorbic acid/mass sample)*100 = ?
NEED HELP WITH CHEMISTRY HW - Ramy Manna, Monday, October 3, 2011 at 8:13pm
Suppose 15.0 mL of 0.315 M NH4Cl is combined with 10.0 mL of 0.430 M (NH4)3PO4. Assume the volumes are additive, and no chemical reaction takes place. What is the total cocentration of ammonium ions in this mixture?
NEED HELP WITH CHEMISTRY HW - Ji, Friday, February 24, 2012 at 2:31pm
9.33 * 10^22 ions NH4
NEED HELP WITH french HW - Anonymous, Wednesday, April 18, 2012 at 12:44pm
la
NEED HELP WITH CHEMISTRY HW - Rediet, Tuesday, May 21, 2013 at 1:47am
4M

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