Which of the following solutions at equimolar solution would give the LOWEST $p H$ $pH$ ?

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Which of the following solutions at equimolar solution would give the LOWEST $p H$ $pH$ ?

$(a)$ $(a)$ $acetonitrile;$ $"acetonitrile;"$
$(b)$ $(b)$ $calcium hydroxide;$ $"calcium hydroxide;"$
$(c)$ $(c)$ $potasium hydroxide;$ $"potasium hydroxide;"$
$(d)$ $(d)$ $hydroiodic acid;$ $"hydroiodic acid;"$
$(e)$ $(e)$ $ammonia.$ $"ammonia."$

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Answer 1 · 2016-11-01T17:36:04

$C a {(O H)}_{2}; K O H; N H_{3}; H C \equiv N; H I$ $Ca(OH)_2; KOH; NH_3; HC-=N; HI$

Explanation:

Hydrogen iodide is definitely the strongest acid in aqueous solution, and thus will give the lowest $p H$ $pH$ .

Hydrocyanic acid is a fairly weak Bronsted acid, but still the $p H$ $pH$ will be well below $7$ $7$ :

$H - C \equiv N + H_{2} O ⇌ H_{3} O^{+} + N \equiv C^{-}$ $H-C-=N + H_2O rightleftharpoons H_3O^+ + N-=C^-$

Next cab off the rank is ammonia, which is a weak base in aqueous solution:

$N H_{3} (a q) + H_{2} O ⇌ N H_{4}^{+} + H O^{-}$ $NH_3(aq) + H_2O rightleftharpoons NH_4^+ + HO^-$

$K O H$ $KOH$ and $C a {(O H)}_{2}$ $Ca(OH)_2$ are strong Bronsted bases, and will dissolve to give quantitative hydroxide ion. Since, you specified equal concentrations, calcium hydroxide delivers 2 equiv hydroxide anion, and will thus give the most basic solution, with the highest value of $p H$ $pH$ .

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Which of the following solutions at equimolar solution would give the LOWEST $p H$ $pH$ ?

$(a)$ $(a)$ $acetonitrile;$ $"acetonitrile;"$
$(b)$ $(b)$ $calcium hydroxide;$ $"calcium hydroxide;"$
$(c)$ $(c)$ $potasium hydroxide;$ $"potasium hydroxide;"$
$(d)$ $(d)$ $hydroiodic acid;$ $"hydroiodic acid;"$
$(e)$ $(e)$ $ammonia.$ $"ammonia."$

1 Answer

Explanation:

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Which of the following solutions at equimolar solution would give the LOWEST pHpHpH?

(a)(a)(a) "acetonitrile;"acetonitrile;"acetonitrile;" (b)(b)(b) "calcium hydroxide;"calcium hydroxide;"calcium hydroxide;" (c)(c)(c) "potasium hydroxide;"potasium hydroxide;"potasium hydroxide;" (d)(d)(d) "hydroiodic acid;"hydroiodic acid;"hydroiodic acid;" (e)(e)(e) "ammonia."ammonia."ammonia."

1 Answer

Explanation:

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Which of the following solutions at equimolar solution would give the LOWEST $p H$ $pH$ ?

$(a)$ $(a)$ $acetonitrile;$ $"acetonitrile;"$
$(b)$ $(b)$ $calcium hydroxide;$ $"calcium hydroxide;"$
$(c)$ $(c)$ $potasium hydroxide;$ $"potasium hydroxide;"$
$(d)$ $(d)$ $hydroiodic acid;$ $"hydroiodic acid;"$
$(e)$ $(e)$ $ammonia.$ $"ammonia."$