For which of the given acids, whose $p K_{a}$ $pK_a$ data are listed, will $p H$ $pH$ be HIGHEST at the equivalence point when titrated by $N a O H (a q)$ $NaOH(aq)$ ?

Question

For which of the given acids, whose $p K_{a}$ $pK_a$ data are listed, will $p H$ $pH$ be HIGHEST at the equivalence point when titrated by $N a O H (a q)$ $NaOH(aq)$ ?

$1 . H A_{1}; p K_{a} = - 2.0 .$ $1. HA_1; pK_a=-2.0.$
$2 . H A_{2}; p K_{a} = 0.052$ $2. HA_2; pK_a=0.052$
$3 . H A_{3}; p K_{a} = 1.13$ $3. HA_3; pK_a=1.13$
$4 . H A_{4}; p K_{a} = - 3.56$ $4. HA_4; pK_a=-3.56$

1 Answer

Impact of this question

1960 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-05-30T14:39:09

$Option 3$ $"Option 3"$

Explanation:

The reaction between the weak acid and strong base is quantitative:

$H A (a q) + N a O H (a q) ⇌ N a^{+} A^{-} + H_{2} O$ $HA(aq) + NaOH(aq) rightleftharpoons Na^+A^(-) + H_2O$

After the reaction has taken place, we have the conjugate base of a weak acid, which is by definition a moderate to strong base. Again, by definition, the weakest acid will have the strongest conjugate base, because the conjugate base competes most strongly for the proton.

Given that the weakest acid is $H A_{3}$ $HA_3$ , i.e. its $K_{a}$ $K_a$ value is the smallest, $A^{-}$ $A^-$ will be the strongest base, $K_{b} = 10^{- 7}$ $K_b=10^-7$ , because $K_{A} \times K_{B} = 10^{- 14}$ $K_AxxK_B=10^-14$ .

You can use this treatment to explain why $N a F$ $NaF$ salts give a basic solution in water, whereas $N a C l$ $NaCl$ salts give a neutral solution. What does this say about the relative acid strengths of $H F$ $HF$ and $H C l$ $HCl$ ? Why?

Science

Math

Humanities

... and beyond

For which of the given acids, whose $p K_{a}$ $pK_a$ data are listed, will $p H$ $pH$ be HIGHEST at the equivalence point when titrated by $N a O H (a q)$ $NaOH(aq)$ ?

$1 . H A_{1}; p K_{a} = - 2.0 .$ $1. HA_1; pK_a=-2.0.$
$2 . H A_{2}; p K_{a} = 0.052$ $2. HA_2; pK_a=0.052$
$3 . H A_{3}; p K_{a} = 1.13$ $3. HA_3; pK_a=1.13$
$4 . H A_{4}; p K_{a} = - 3.56$ $4. HA_4; pK_a=-3.56$

1 Answer

Explanation:

Related questions

Impact of this question

Science

Math

Humanities

... and beyond

For which of the given acids, whose pKapK_a data are listed, will pHpH be HIGHEST at the equivalence point when titrated by NaOH(aq)NaOH(aq)?

1.HA1;pKa=−2.0.1. HA_1; pK_a=-2.0. 2.HA2;pKa=0.0522. HA_2; pK_a=0.052 3.HA3;pKa=1.133. HA_3; pK_a=1.13 4.HA4;pKa=−3.564. HA_4; pK_a=-3.56

1 Answer

Explanation:

Related questions

Impact of this question

For which of the given acids, whose $p K_{a}$ $pK_a$ data are listed, will $p H$ $pH$ be HIGHEST at the equivalence point when titrated by $N a O H (a q)$ $NaOH(aq)$ ?

$1 . H A_{1}; p K_{a} = - 2.0 .$ $1. HA_1; pK_a=-2.0.$
$2 . H A_{2}; p K_{a} = 0.052$ $2. HA_2; pK_a=0.052$
$3 . H A_{3}; p K_{a} = 1.13$ $3. HA_3; pK_a=1.13$
$4 . H A_{4}; p K_{a} = - 3.56$ $4. HA_4; pK_a=-3.56$