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23 Nov 2019

Piperazine, C₄H₁₀N_2, isadiprotic weak base (pk_b1=4.22 andpk_b2=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?

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Tod ThielLv2

10 Feb 2019

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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

silverhyena28

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 waterand titrated with 0.500 M HCl. It takes 48.00 mL of HCl to reachthe second equivalence point.

SHOW ALL WORK

a) What was the original concentration of the piperazinesolution?

b) Calculate the pH after the following amounts of HCl have beenadded: 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 ollowing indicators could be used to detect thefirst equivalence point? The second?

Indicator Ka ColorChange

______________________________________________________________

Bromocresolgreen 2.5x10^-5 yellow=> blue-green

PhenolRed 2.5x10^-8 yellow=> red

MethylYellow 3.5x10^-4 red =>yellow

AlizarinYellow 8.9x10^-12 yellow=> red

aquamarinekoala68

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 waterand titrated with 0.500 M HCl. It takes 48.00 mL of HCl to reachthe second equivalence point.

SHOW ALL WORK

a) What was the original concentration of the piperazinesolution?

b) Calculate the pH after the following amounts of HCl have beenadded: 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 ollowing indicators could be used to detect thefirst equivalence point? The second?

Indicator Ka ColorChange

______________________________________________________________

Bromocresolgreen 2.5x10^-5 yellow=> blue-green

PhenolRed 2.5x10^-8 yellow=> red

MethylYellow 3.5x10^-4 red =>yellow

AlizarinYellow 8.9x10^-12 yellow=> red

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