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(Solved): a. A 1 liter solution contains 0.381 M nitrous acid and 0.286 M sodium nitrite. Addition o ...



a. A 1 liter solution contains 0.381 M nitrous acid and 0.286 M sodium nitrite. Addition of 0.143 moles of perchloric acid will:

(Assume that the volume does not change upon the addition of perchloric acid. Select all that apply.)

Raise the pH by several units
Exceed the buffer capacity
Lower the pH slightly
Lower the pH by several units
Not change the pH
Raise the pH slightly

b. A 1 liter solution contains 0.437 M nitrous acid and 0.583 M sodium nitrite. Addition of 0.481 moles of sodium hydroxide will:

(Assume that the volume does not change upon the addition of sodium hydroxide. Select all that apply.)

Lower the pH by several units
Lower the pH slightly
Raise the pH slightly
Raise the pH by several units
Exceed the buffer capacity
Not change the pH

c. A 1 liter solution contains 0.352 M hydrofluoric acid and 0.469 M sodium fluoride. Addition of 0.176 moles of potassium hydroxide will:

(Assume that the volume does not change upon the addition of potassium hydroxide. Select all that apply.)

Not change the pH
Lower the pH slightly
Raise the pH slightly
Lower the pH by several units
Exceed the buffer capacity
Raise the pH by several units

 


 

 

 



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a). Moles of HNO2 = Concentration × Volume = 0.381 M × 1 L = 0.381 mol Moles of NaNO2 = 0.286 M × 1 L = 0.286 mol If we add 0.143 mol HClO4 (strong acid) then it will neutralize NaNO2 as, NO2- + H+ ? HNO2 So, equilibrium moles of NaNO2 remaining = 0.
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