1a) A 1 liter solution contains 0.425 M hydrocyanic acid and 0.567 M potassium c
ID: 303651 • Letter: 1
Question
1a)
A 1 liter solution contains 0.425 M hydrocyanic acid and 0.567 M potassium cyanide. Addition of 0.468 moles of calcium hydroxide will:
(Assume that the volume does not change upon the addition of calcium hydroxide.) (check boxes)
Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity
1b)
A 1 liter solution contains 0.508 M nitrous acid and 0.381 M potassium nitrite.
Addition of 0.419 moles of hydroiodic acid will:
(Assume that the volume does not change upon the addition of hydroiodic acid.)
Raise the pH slightly
Lower the pH slightly
Raise the pH by several units
Lower the pH by several units
Not change the pH
Exceed the buffer capacity
Explanation / Answer
1 a ) raise the pH slightly ( when addition of calcium hydroxide it will leads to basicity because the calcium hydroxide is a basic in nature )
1 b ) lower the pH slightly ( when we add hydroiodic acid , it will leads to the compound become acidic because hydroiodic acid is halogen acid it is responsible for acidity of a solution )
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