Chemistry Help?

Question

Determining Whether Salt Solutions are Acidic, Basic, or Neutral

In each of the following, indicate which salt in each of the following pairs will form the more acidic (or less basic) 0.010 M soluDon:

(a) NaNO3, or Fe(NO3)3;

(b) KBr, or KBrO;

(c) CH3NH3Cl, or BaCl2, (

d) NH4NO2, or NH4NO3. 

 

Answer 1

Step 1:

(a)

NaNO₃ contains sodium ion Na⁺ and NO₃^-.

Na⁺ is a spectator and NO₃^- is the conjugate base of strong acid.

pH of the NaNO₃ is equal to 7.

NaNO₃ is neutral in nature.

 

Fe(NO₃)₂ contains Fe and NO₃^- ions.

Fe is acidic due to metallic nature and they are obtained from weak base.

NO₃^- is the conjugate base of strong acid.

pH of the Fe(NO₃)₂ is less than 7.

Fe(NO₃)₂ is acidic in nature.

Fe(NO₃)₂ is more acidic in nature than NaNO₃.

Step 2:

(b)

KBr contains sodium ion K⁺ and Br^-.

K⁺ is obtained from strong base.

Br^- is the conjugate base of strong acid.

pH of the KBr is equal to 7.

KBr is neutral in nature.

 

KBrO contains sodium ion K⁺ and BrO^-.

K⁺ is obtained from strong base.

BrO^- is cation of strong base.

pH of the KBrO is greater than 7.

KBrO is basic in nature.

KBr is more acidic in nature than KBrO.

Step 3:

(c)

CH₃NH₃Cl contains CH₃NH₂Cl^- and H⁺.

CH₃NH₂Cl^- is obtained from weak acid.

pH of the CH₃NH₃Cl is less than 7.

CH₃NH₃Cl is weak acid.

 

BaCl₂ contains sodium ion Br⁺ and Cl^-.

Cl^- is a conjuagte base of strong acid.

Br^- is obtained strong base.

pH of the BaCl₂ is equal to 7.

BaCl₂ is neutral in nature.

CH₃NH₃Cl is more acidic in nature than BaCl₂.

Step 4:

(d)

NH₄NO₂ is formed by NH₄OH and HNO₂.

HNO₂ is a weak acid.

NH₄OH is a weak base.

pH of the NH₄NO₂ is equal to 7.

NH₄NO₂ is neutral in nature.

NH₄NO₃ is acidic in nature.

NH₄NO₃ is formed by NH₄OH and HNO₃.

NH₄OH is a weak base and HNO₃ is a strong acid.

pH of the NH₄NO₃ is less than 7.

NH₄NO₃ is more acidic in nature than NH₄NO₂.

Solution:

(a) Fe(NO₃)₂ is more acidic in nature than NaNO₃.

(b) KBr is more acidic in nature than KBrO.

(c) CH₃NH₃Cl is more acidic in nature than BaCl₂.

(d) NH₄NO₃ is more acidic in nature than NH₄NO₂.