Potassium hydrogen tartrate is an acid that is used in making cookies such as snicker doodles. (At your home, it is called cream of tartar.) It can be titrated with a base such as KOH to determine purity. A sample of 0.400 g is titrated to a pink endpoint with 19.62 mL of 0.1044 M KOH. Determine the percent potassium hydrogen tartrate (KHC4H4O6) in the sample.
Answer:
Moles KOH = 19.62 x 0.1044 /1000 = 0.002048 = moles potassium hydrogen tartrate
Molar mass potassium hydrogen tartrate = 188.177 g/mol
0.002048 moles x 188.177 g/mol = 0.3854 g of potassium hydrogen tartrate in the sample
0.3854 : 0.400 = x : 100
x = 96.46 %
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