. answer this question I need them now please thanks 1. What are the components
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answer this question I need them now please thanks
1. What are the components of a buffer system? 2. Is a solution of citric acid and sodium citrate a buffer. Justify your answer 3. How does a buffer neutralize a strong acid? 4. The K, for lactic acid is 1.4x10. What is its pk, ? 5. Using the Henderson-Hasselbach equation, what is the pH of a buffer when the concentrations of its weak acid and conjugate base are equal? 6. You have the molar solubility of a salt. How do you convert that unit to g/100mL? 7. Write the ion product equation for Ba,(PO,) 8. The solubility of strontium carbonate, SrCO, will (increase / decrease / not be affected) by a decrease in pH. Why?Explanation / Answer
Q1
A buffer is any type of substance that will resist pH change when H+ or OH- is added.
This is typically achieved with equilibrium equations. Both type of buffer will resist both type of additions.
When a weak acid and its conjugate base are added, they will form a buffer
The equations:
The Weak acid equilibrium:
HA(aq) <-> H+(aq) + A-(aq)
Weak acid = HA(aq)
Conjugate base = A-(aq)
Neutralization of H+ ions:
A-(aq) + H+(aq) <-> HA(aq); in this case, HA is formed, H+ is neutralized as well as A-, the conjugate
Neutralization of OH- ions:
HA(aq) + OH-(aq) <-> H2O(l) + A-(aq) ; in this case; A- is formed, OH- is neutralized as well as HA.
Now,
For the weak base equilibrium:
B(aq) + H2O(l) <-> BH+(aq) + OH-(aq)
Weak base = B;
Conjugate acid = BH+
Neutralization of OH- ions:
BH+(aq) + OH-(aq) <-> B(aq) + H2O(l); in this case, OH- is neutralized by BH+, as well as B is created
Neutralization of H+ ions:
B(aq) + H+(aq) <-> BH+(aq)
Q2
citric acid = H3A
sodium citrate buffer --> Na3A, Na2HA, NaH2A
yes i tis a buffer since:
citric aicd + citrate ion are present (conjguate base)
Q3
a buffer will neutralize acid via:
A- + H+ = HA
conjugate base, A- will accept H+ as proton, it forms the weak acid HA
Q4
pH = pKa + log(A-/HA)
if A- =HA
pH= pKa + log(1)
pH = pKA
Q6
solubility --> mol per liter --> change to mass per liter --> Change to mass per 100 mL
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