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Buffer is formed from weak acid and its salt with strong base (its conjugate base)
So the only one correct answer is :
0.2 M H₃PO₄ and 0.2 M NaH₂PO₄
While all other choices are incorrect
Answer:
pH = 3.347
NO₂⁻ + H₃O⁺ → HNO₂
Explanation:
If the buffer is made with 0.417M of HNO₂ and 0.417M of NaNO₂ the pH of the solution is = pKa. <em>A buffer which concentration of weak acid and conjugate base is the same has a pH = pKa</em>
As Ka of the solution is 4.50x10⁻⁴, pKa is -log 4.50x10⁻⁴ = 3.347. Thus,<em> pH = 3.347</em>
<em />
The net ionic equation that occurs when 0.120 mol of HCl is added to 1.00L of the solution is:
<em>NO₂⁻ + H₃O⁺ → HNO₂ + H₂O</em>
<em>The conjugate base (NaNO₂) reacts with strong acid (HCl, source of H₃O⁺) producing weak acid (HNO₂) and water. If a strong base is added, the weak acid reacts producing conjugate base and water.</em>
Answer:
<h3>Oxygen is a non metal </h3>
Explanation:
It is colour less gas
