Gifblaar is a small South African shrub and one of the most poisonous plants knownbecauseit contains fluoroacetic acid (FCH2COOH), which has a pKaof 2.59.Calculate the initial concentration of fluoroacetic acid in a solution that has the same pH as a 0.00760 M solution of HCl.  Nitric acid (HNO3) is a strong acid that is completely ionized in aqueous solutions of concentrations ranging from 1% to 10% (1.50 M ). However, in more concentrated solutions, part of the nitric acid is present as un-ionized molecules of HNO3. For example, in a 50% solution (7.50 M ) at 25°C, only 33% of the molecules of HNO3 dissociate into H+ and NO3–. What is the value of Ka for HNO3? Pyridine (C5H5N) is a particularly foul-smelling substance used in manufacturing pesticides and plastic resins. Calculate the pH of a 0.145 M  solution of pyridine (Kb = 1.4×10-9 ). The acetate ion is the conjugate base of acetic acid. The Ka of acetic acid is 1.76×10–5.What is the pH of a 0.400 M  solution of sodium acetate?  Write a chemical equation for the hydrolysis reaction that explains why an aqueous solution of CH3NH3Cl is acidic.[Please include the states of matter with each chemical species. Remember, it is an equilibrium reaction.]

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Asked Oct 24, 2019
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Gifblaar is a small South African shrub and one of the most poisonous plants knownbecauseit contains fluoroacetic acid (FCH2COOH), which has a pKaof 2.59.

Calculate the initial concentration of fluoroacetic acid in a solution that has the same pH as a 0.00760 M solution of HCl. 

 

Nitric acid (HNO3) is a strong acid that is completely ionized in aqueous solutions of concentrations ranging from 1% to 10% (1.50 ). However, in more concentrated solutions, part of the nitric acid is present as un-ionized molecules of HNO3. For example, in a 50% solution (7.50 ) at 25°C, only 33% of the molecules of HNO3 dissociate into H+ and NO3. What is the value of Ka for HNO3?

 

Pyridine (C5H5N) is a particularly foul-smelling substance used in manufacturing pesticides and plastic resins. Calculate the pH of a 0.145  solution of pyridine (Kb = 1.4×10-9 ).

 

The acetate ion is the conjugate base of acetic acid. The Ka of acetic acid is 1.76×10–5.

What is the pH of a 0.400  solution of sodium acetate? 

 

Write a chemical equation for the hydrolysis reaction that explains why an aqueous solution of CH3NH3Cl is acidic.

[Please include the states of matter with each chemical species. Remember, it is an equilibrium reaction.]

 
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Expert Answer

Step 1

Given:

pKa =2.59.

concentration of H3O+= 0.00760 M

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FCH2 COOH(aq) H20() FCH2coo (aq) H30(aq) FCH2COO НО FCH2COOH Initial x-0.00760 M 0.00760 M 0.00760 M

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Step 2

Calculation for Ka:

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- log(Ka -log (K.) PKa 2.59 Ka 2.57 x 10-3

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Step 3

Calculation for initial concentration of FCH2COOH:

Let [H3O+] = [FCH2COO-...

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[FCH2CO0 [H30* Ка FCH2COOH] (0.00760)(0.00760) Ка х — 0.00760 5.776 х 10-5 2.57 х 10-3 х — 0.00760 х— 0.00760 - 0.02247 х — 0.00760 +0.02247 х3D 0.03007

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