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#### All Subjects Geology General Geology

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# that you have 0.500 L of each of the following solutions, and an unlimited supply of

Question # 00130866
Subject: Geology
Due on: 12/08/2015
Posted On: 11/08/2015 02:38 PM

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Question 1)Suppose that you have 0.500 L of each of the following solutions, and an unlimited supply of water.
(Note: C9H7NHBr is a salt containing the ions C9H7NH+ and Br- and C9H7N is quinoline, an organic
base with pKb = 6.24 at 298 K. If you like, you may represent C9H7NH+ as HB+ and C9H7N as B.)
Data
0.113 mol L-1 C9H7NHBr (aq)
0.104 mol L-1 HBr(aq)
0.122 mol L-1 NaOH(aq)
(a) Provide simple instructions for preparing 1.00 L of a solution having pH = 7.00 at 298 K.
Your instructions should include the volumes of the solutions required.
(b) What is the buffer capacity of the resulting solution? (The buffer capacity is the
number of moles of NaOH that must be added to 1.0 L of solution to raise the pH by one unit.)

Question 2)

Ethylamine, CH3CH2NH2, is an organic base with pKb= 3.367 at 298 K. In an experiment, a 40.0 mL sample of 0.105 mol L-1CH3CH2NH2(aq) is titrated with 0.150 mol L-1HI(aq) solution at 298 K.

(a)(5 marks)Write a balanced chemical equation for the neutralization reaction upon which this titration is based, and indicate clearly which atom is being protonated. Then, calculate the equilibrium constant for the neutralization reaction. (Hint: To calculate the equilibrium constant, you may find it helpful to represent the neutralization reaction as the sum of two separate reactions.)

(b) Calculate the pH, [CH3CH2NH2], and [CH3CH2NH3+] at the following stages of the titration. i)before the addition of any HI solution.

ii)after the addition of 20.0 mL of HI solution.

iii)at the equivalence point.

iv)after the addition of 60.0 mL of HI solution.

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#### that you have 0.500 L of each of the following solutions, and an unlimited supply of

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Tutorial Preview …as xxx and xxxxx as B x Data 0 xxx mol xxx xxxxxxxx (aq) x 104 mol xxx HBr(aq) 0 xxx mol xxx xxxxxxxx (a) xxxxxxx simple instructions xxx preparing 1 xx L xx x solution xxxxxx pH = x 00 at xxx K xxxx xxxxxxxxxxxx should xxxxxxx the volumes xx the solutions xxxxxxxx (b) xxxx xx the xxxxxx capacity of xxx resulting solution? xxxx buffer xxxxxxxx xx the xxxxxx of moles xx NaOH that xxxx…
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170001.docx (35.62 KB)
Preview: and xxxxx as x ) Data x 113 mol xxx C9H7NHBr xxxx x 104 xxx L-1 HBr(aq) x 122 mol xxx NaOH(aq) xxx xxxxxxx simple xxxxxxxxxxxx for preparing x 00 L xx a xxxxxxxx xxxxxx pH x 7 00 xx 298 K xxxx instructions xxxxxx xxxxxxx the xxxxxxx of the xxxxxxxxx required (b) xxxx is xxx xxxxxx capacity xx the resulting xxxxxxxxx (The buffer xxxxxxxx is xxx xxxxxx of xxxxx of NaOH xxxx must.....
170002.docx (20.22 KB)
Preview: K xxxx instructions xxxxxx include the xxxxxxx of the xxxxxxxxx required xxx xxxx is xxx buffer capacity xx the resulting xxxxxxxxx (The xxxxxx xxxxxxxx is xxx number.....
170003.doc (35.74 KB)
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