A solution of potassium fluoride turns litmus paper blue. What are the products of the modified Arrhenius net ionic equation for this compound? Question options: $~ H_{2} O$ $~H_2O$ $~ F^{-}$ $~F^-$ $~ H F$ $~HF$ $~ H_{3} O^{+}$ $~H_3O^+$ $~ H K F^{+}$ $~HKF^+$ $~ O H^{-}$ $~OH^-$

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A solution of potassium fluoride turns litmus paper blue. What are the products of the modified Arrhenius net ionic equation for this compound? Question options: $~ H_{2} O$ $~H_2O$ $~ F^{-}$ $~F^-$ $~ H F$ $~HF$ $~ H_{3} O^{+}$ $~H_3O^+$ $~ H K F^{+}$ $~HKF^+$ $~ O H^{-}$ $~OH^-$

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Answer 1 · 2017-05-28T18:01:05

$F^{-} + H_{2} O (l) ⇌ H F (a q) + H_{2} O (l)$ $F^(-) + H_2O(l) rightleftharpoonsHF(aq) + H_2O(l)$

Explanation:

$H F$ $HF$ is a WEAK acid in aqueous solution.......i.e.

$H F (a q) + H_{2} O (l) ⇌ F^{-} + H_{3} O^{+}$ $HF(aq)+H_2O(l)rightleftharpoonsF^(-) + H_3O^+$

$K_{a} = 10^{- 3.17} = 6.76 \times 10^{- 4}$ $K_a=10^(-3.17)=6.76xx10^-4$ .

If we describe something as a weak acid, we might also describe its conjugate base as reasonably strong in that it competes for the proton effectively. Fluoride thus gives rise to a basic solution, and this is in contrast to the solution behaviour of $H C l$ $HCl$ , $H B r$ $HBr$ , $H I$ $HI$ , for which in aqueous solution, the equilibrium LIES strongly to the right.

$H X (a q) + H_{2} O (l) \to X^{-} + H_{3} O^{+}$ $HX(aq)+H_2O(l)rarrX^(-) + H_3O^+$
$X \neq F, X = C l, B r, I$ $X!=F, X=Cl, Br, I$

And thus while $C l^{-}$ $Cl^-$ , $B r^{-}$ $Br^-$ , and $I^{-}$ $I^-$ ARE WEAK Bronsted bases, $F^{-}$ $F^-$ , being smaller and more charge dense, is a moderately strong Bronsted base.

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A solution of potassium fluoride turns litmus paper blue. What are the products of the modified Arrhenius net ionic equation for this compound? Question options: $~ H_{2} O$ $~H_2O$ $~ F^{-}$ $~F^-$ $~ H F$ $~HF$ $~ H_{3} O^{+}$ $~H_3O^+$ $~ H K F^{+}$ $~HKF^+$ $~ O H^{-}$ $~OH^-$

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A solution of potassium fluoride turns litmus paper blue. What are the products of the modified Arrhenius net ionic equation for this compound? Question options: ~H2O~H_2O ~F−~F^- ~HF~HF ~H3O+~H_3O^+ ~HKF+~HKF^+ ~OH−~OH^-

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A solution of potassium fluoride turns litmus paper blue. What are the products of the modified Arrhenius net ionic equation for this compound? Question options: $~ H_{2} O$ $~H_2O$ $~ F^{-}$ $~F^-$ $~ H F$ $~HF$ $~ H_{3} O^{+}$ $~H_3O^+$ $~ H K F^{+}$ $~HKF^+$ $~ O H^{-}$ $~OH^-$