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What volume of 0.500 M HCl is needed to reach the first equivalence point?

A 1.00-g sample of piperazine hexahydrate is dissolved in enough water to produce 100.0 mL of solution and is titrated with 0.500 M HCl.

pKb1=4.22
pKb2=8.67

The pH at the first equivalence pt is 7.56.

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Kenneth Duque
Kenneth DuqueLv10
18 Nov 2020

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Related questions

Piperazine, HN(C4H8)NH, is a diprotic weak base used as acorrosion inhibitor and an insecticide and has the followingproperties:

pKb1=4.22pKb2=8.67

For writing the reactions of this base in water, it can behelpful to abbreviate the formula as Pip:

Pip+H2OPipH++H2O??PipH++OH?PipH22++OH?

The piperazine used commercially is a hexahydrate with theformula C4H10N2?6H2O

What is the pH at the second equivalence point?

Piperazine, C4H10N2, is a diprotic weak base (pKb1 = 4.22 and pKb2 = 8.67). A sample of piperazine is dissolved in 100.0 mL of water and titrated with 0.500 M HCl. It takes 48.00 mL of HCl to reach the second equivalence point.

 

SHOW ALL WORK

 

a) What was the original concentration of the piperazine solution?

b) Calculate the pH after the following amounts of HCl have been added: 0 mL, 12.00mL, 24.00mL,36.00mL, 48.00mL, and 60.00mL

c) Sketch the titration curve for this titration

d) Which of the following indicators could be used to detect the first equivalence point? The second?

     Indicator                              Ka                         Color Change

     ______________________________________________________________

     Bromocresol green             2.5 x 10^-5             yellow => blue-green

     Phenol Red                         2.5 x 10^-8            yellow => red

     Methyl Yellow                     3.5 x 10^-4             red     => yellow

     Alizarin Yellow                     8.9 x 10^-12          yellow => red

Piperazine, C4H10N2, isadiprotic weak base (pkb1=4.22 andpkb2=8.67.A sample of piperazine is dissolved in 100.0mL of water andtitrated with .500 M HCl. It takes 48.00 mL of HClto reach thesecond equivalence point.
What was the orginal concentration of thepiperazinesolution?
Thanks and please show how you got your answer :)

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