The salt ethyl amine chloride (CH,CH, NH,cl) was derived from a strong acid (HCl

Question

The salt ethyl amine chloride (CH,CH, NH,cl) was derived from a strong acid (HCl) and a weak base, CH,CH2NH2 (K chloride. 4.3 x 10). Estimate the pH of a solution of ethyl ammonium a) close to neutral b) basic c) acidic d) more information is required e salt sodium acetate (CHj,CH Co, Na) was derived from a strong base (NaOH) and a k acid, CH3CH2co,H (Ka-1.8 x 10 s). Estimate the pH of a solution of sodium acetate. a) close to neutral b) basic c) d) acidic more information is required The salt ammonium cyanide (NH.CN) was derived from a weak base (NH,, K, 8 x 109) and a weak acid (HCN, K, - 4.9 x 101). Estimate the pH of a solution of sodium acetate. a) close to neutral b) basic c) d) acidic more information is required

Explanation / Answer

We can determine whether a solution of a salt is acidic, basic, or neutral by identifying the ions in solution and by assessing how each ion will affect the pH.

1. The salt ethyl amine hydrochloride (CH3CH2NH3+ Cl-) was derived from weak base ethyl amine (CH3CH2NH2) and string acid HCl. What will be the pH of the the resulting solution?

In this solution, CH3CH2NH3+ is the conjugate acid of a weak base (CH3CH2NH2) and is therefore acidic. Cl? is the conjugate base of a strong acid (HCl) and therefore has no influence on the pH of the solution. Because the solution contains an ion that is acidic (CH3CH2NH3+) and one that has no influence on pH (Cl?), the solution of ethyl amine hydrochloride will be acidic.

2. The salt sodium acetate (CH3COO-Na+) was derived from weak acid acetic acid (CH3COOH) and strong base NaOH. What will be the pH of the the resulting solution?

In this solution, CH3COO- is the conjugate base of a weak acid (CH3COOH) and is therefore basic. OH? is the conjugate acid of a strong a base (KOH) and therefore has no influence on the pH of the solution. Because the solution contains an ion that is basic (CH3CH2NH3+) and one that has no influence on pH (OH?), the solution of sodium acetate will be basic.

3. The salt ammonium cyanide(NH4+CN-) was derived from a weak base NH3 and weak acid HCN. Estimate the pH of the solution of Ammoium Cyanide?

In this solution, NH4+ is the conjugate acid of a weak base (NH3) and is therefore acidic. CN? is the conjugate base of a weak acid (HCN) and is therefore basic. Because the solution contains an ion that is acidic (NH4+) and basic (CN?), the solution of ammonium cyanide will be close to neutral.

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