In the titration of a weak acid, both a neutralization reaction and an acid‐dissociation equilibrium reaction...

In the titration of a weak acid, both a neutralization reaction and an acid‐dissociation equilibrium reaction with water (Ka) are occurring. Provide a molecular‐level explanation that describes how these two reactions contribute to the resulting pH observed during the drop‐by‐drop addition of NaOH during a titration procedure.

Expert Solution

queen_honey_blossom answered 2 years ago

Dissociation Constant For the dissociation reaction of a weak acid in water, HA(aq)+H2O(l)?H3O+(aq)+A?(aq) the equilibrium constant...

Dissociation Constant For the dissociation reaction of a weak acid in water, HA(aq)+H2O(l)?H3O+(aq)+A?(aq) the equilibrium constant is the acid-dissociation constant, Ka, and takes the form Ka=[H3O+][A?][HA] Weak bases accept a proton from water to give the conjugate acid and OH? ions: B(aq)+H2O(l)?BH+(aq)+OH?(aq) The equilibrium constant Kb is called the base-dissociation constant and can be found by the formula Kb=[BH+][OH?][B] When solving equilibrium-based expression, it is often helpful to keep track of changing concentrations is through what is often called an...

Calculation of pH after Titration of Weak Acid: Calculation of pH after Titration of Weak Acid:...

Calculation of pH after Titration of Weak Acid: Calculation of pH after Titration of Weak Acid: A compound has a p K a of 7.4. To 100 mL of a 1.0 M solution of this compound at pH 8.0 is added 30 mL of 1.0 M hydrochloric acid. What is the pH of the resulting solution? Can you explain what to do after 3.98 = A/HA

Consider a titration curve for a weak base and a strong acid. Suppose both phenolphthalein and...

Consider a titration curve for a weak base and a strong acid. Suppose both phenolphthalein and bromocresol green are present in the solution. What color changes would occur at pH 10, pH 7, and pH 3?

Calculate the equilibrium constant for the following reaction of a weak acid and base HClO(aq) +...

Calculate the equilibrium constant for the following reaction of a weak acid and base HClO(aq) + NH3(aq) NH4+(aq) + ClO-(aq) given Ka (HClO) = 2.8 × 10-8, Kb (NH3) = 1.8 × 10-5 and Kw = 1.0 × 10-14.

Benzoic acid is a weak monoprotic acid occurring in most of berries. The acid dissociation constant...

Benzoic acid is a weak monoprotic acid occurring in most of berries. The acid dissociation constant of benzoic acid is 6.3 x 10-5. Find pH and percent of dissociation of 0.001 M solution of benzoic acid.

When a strong acid is neutralized by a weak base is the neutralization complete? Write the...

When a strong acid is neutralized by a weak base is the neutralization complete? Write the neutralization reaction for HClO4 and NH3. What is the value of Kn (equilibrium constant for neutralization)? (Kb(NH3)=1.810‒5) If stoichiometric amounts of acid and base are reacted will the resulting solution be acidic, basic or neutral?

Weak base/ Strong acid titration curve question. 1) In the titration of .0400 M weak base...

Weak base/ Strong acid titration curve question. 1) In the titration of .0400 M weak base B of 50 ml with .100 M HCl. What is the solution pH before any HCl is added? 2) In the titration of .0400 M weak base B of 50 ml with .100 M HCl. What is the solution pH after 10 ml HCl is added? 3) In the titration of .0400 M weak base B of 50 ml with .100 M HCl. What...

Carbonic acid (H2CO3) is a diprotic weak acid that undergoes the following dissociation reactions: H2CO3 ⇌...

Carbonic acid (H2CO3) is a diprotic weak acid that undergoes the following dissociation reactions: H2CO3 ⇌ H+ + HCO3− Ka1 = 4.3 x 10−7 HCO3− ⇌ H+ + CO32− Ka2 = 5.6 x 10−11 For a 0.020 M solution of carbonic acid in water, which of the following is true? [HCO3−] = [CO32−] [H+] = Ka1 [CO32−] = Ka2 Ka1 = Ka2 [H+] = Ka2

a) Why would there be a mathematical relation between the dissociation constant of a weak acid...

a) Why would there be a mathematical relation between the dissociation constant of a weak acid and the pH of a solution? Write the HH equation as a generalized mathematical expression. b) What is the relation between the concentrations of a weak acid and its conjugated base when the pH of the solution is identical with the acid’s pKa? Explain

What is the purpose of the experiements determining the dissociation constant of a weak acid using...

What is the purpose of the experiements determining the dissociation constant of a weak acid using ph measurement and monitoring acid-base titrations with a ph meter? We combined both experiements together into one, just not understand the purpose of the experiment.

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