Question

In: Chemistry

Which of the following solutions is basic? a. 0.10 M NH4ClO4 b. 0.10 M NH4Cl c....

Which of the following solutions is basic?

a. 0.10 M NH4ClO4

b. 0.10 M NH4Cl

c. 0.10 M NaNO3

d. 0.10 M NaI

e. 0.10 M NaCN

The correct answer is listed as E. Please explain why. I don't understand

Expert Solution

a. 0.10 M NH₄ClO₄ ==> In water NH₄⁺ and ClO₄^-=> strong conjugate acid and weak conjugate base

In water they exist as: NH ₄ OH, H⁺ and ClO₄^-

=> Result: acidic

b. 0.10 M NH₄Cl ==> In water NH₄⁺ and Cl^-=> strong conjugate acid and weak conjugate base

In water they exist as: NH₄OH, H⁺ and Cl^-

=> Result: acidic

c. 0.10 M NaNO₃ ==>In water Na⁺ and NO₃^-=> strong conjugate base and strong conjugate acid

In water they exist as: Na⁺, OH^-, H⁺ and Cl^-

=> Result: Neutral

d. 0.10 M NaI ==> In water Na⁺ and I^-=> weak conjugate acid and weak conjugate base

In water they exist as: Na⁺, OH^-, H⁺ and I^-

=> Result: Neutral

e. 0.10 M NaCN ==> In water Na⁺ and CN^-=> weak conjugate acid and strong conjugate base

HCN is a weak acid.

In water they exist as: Na⁺, OH^- and HCN.

=> Result: Basic

NB: strong conjugate acid or base have potential to capture OH^- or H⁺ respectivelly. Thus the solution will become acidic (strong conjugate acid) or basic (strong conjugate base).

queen_honey_blossom answered 2 years ago

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