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Chemistry help?

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Example 2: Titrate 25.00 mL of 0.100 M HCl with 0.100 M CH3NH2 and determine the pH of the mixture at the following points of the 9tra9on curve:

a. When 10.00 mL of CH3NH2 has been added b. When 25.00 mL of CH3NH2 has been added c. When 35.00 mL of CH3NH2 has been added 

 

asked Mar 30, 2015 in CHEMISTRY by heather Apprentice

3 Answers

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Step 1:

25.00  mL of 0.100 M HCL is 2.5 mMOL of .

The chemical reaction of Methylamine reacts with water :

(a)

When 10.00 mL of is added.

25.00  mL of 0.100 M HCL is 2.5 mMOL of .

10.00  mL of 0.100 M is 1 mMOL of .

Number of moles of acid left after reaction :

2.5 mMOL of -  1 mMOL of = 1.5 mMOL of

Find .

Solution :

image.

answered Mar 31, 2015 by joseph Apprentice
edited Mar 31, 2015 by joseph
0 votes

Step 1:

25.00  mL of 0.100 M HCL is 2.5 mMOL of .

The chemical reaction of Methylamine reacts with water :

(b)

When 25.00 mL of is added.

25.00  mL of 0.100 M HCL is 2.5 mMOL of .

25.00  mL of 0.100 M is 2.5 mMOL of .

Number of moles of acid left after reaction :

2.5 mMOL of -  2.5 mMOL of = 0 mMOL of

At equilibrium concentration :

The HCL solution of ionization constant is

Find .

Solution :

image.

answered Mar 31, 2015 by joseph Apprentice
0 votes

Step 1:

25.00  mL of 0.100 M HCL is 2.5 mMOL of .

The chemical reaction of Methylamine reacts with water :

(c)

When 25.00 mL of is added.

25.00  mL of 0.100 M HCL is 2.5 mMOL of .

35.00  mL of 0.100 M is 3.5 mMOL of .

Number of moles of base left after reaction :

3.5 mMOL of - 2.5 mMOL of -  = 1 mMOL of

Find .

image

Solution :

image.

answered Mar 31, 2015 by joseph Apprentice

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