Question

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Why does a solution of a weak acid and its conjugate base act as a better buffer than does a solution of the weak acid alone? The presence of both the acid and the base provides a significant concentration of both an acid and a base, making it harder to change the pH A solution of a weak acid alone has no base present to absorb added acid. The presence of both the base and the acid increases the ionic strength of the solution and limits the pH changes. A solution of a weak acid alone has a pH that is too low to be of general use. Question 5 3 pts What reaction occurs as a hydrochloric acid solution is added to a solution containing equal concentrations of acetic acid (CH3COOH) and sodium acetate (CH3COONa)? OCH3COOH + H+ CH3COOH2+ O 2CH3COOH + 2H+ CH3COO + H2 CH3COOH + H+ CH3COOH OCH3COOH + HCI-CH3COO+H2CH+

Answer 1

both an acid and a Ausy › @ The presence of both acid and AS the base provides a significant concentration of base, making it houden to change the pho It is because ph of a given by PHe tog pkat logo [conjugate Base] buffer is a I Acid Ans when he is added to equal conco CH3Coona, containing a soln CH3COOH of CH₃Coo- +H+ CH3COOH takes place So, ® is the answer.

Date : We can the around if Ans6 @ HCOOH H+ + HCOO- Ka=1077x10-4 ignore "-" terem in ka very less с the orden of So, ka 1077x10-210-2 С As it is big enough it cannot ignore "- term. 10-4. 1077x10-4 lo-2 T Po we . - (6) + NaCN +H 2 Ou ZHCN TOH Now here Kb A Now, Krone Kw Kb = 10-14 6.172x lo-do 1662x10-5 Here 0 Kхх 6.1722 10-10 0.0 125 4.93 x 10-8 << 10-4 so, in this case the "X" terme this case, we can ignore

I » 2 > 1.76x10-5 1076x10 3 > 103 c 0.01 So, we cannot ignore. Ka 1x10-2 I С Orl So, we cannot ignon Thus, the answer is 6 او او علما = re