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Question
নিচের কোনটি বাফার দ্রবণ?
C
H
3
C
O
O
H
&
N
a
O
H
C
H
3
C
O
O
H
&
C
H
3
C
O
O
N
a
N
a
O
H
&
N
a
2
C
O
2
H
C
l
&
N
a
C
l
ANSWER : 2
Descrption
<p style="margin-left:0px;">The correct answer is: <strong>C</strong>H₃COOH & CH₃COONa (acetic acid & sodium acetate)</p><p style="margin-left:0px;"><strong>Explanation:</strong></p><p style="margin-left:0px;">A buffer solution is a solution that can resist changes in pH when small amounts of acid or base are added. It contains a weak acid and its conjugate base (or a weak base and its conjugate acid).</p><ul><li><strong>CH₃COOH (acetic acid):</strong> This is a weak acid.</li><li><strong>CH₃COONa (sodium acetate):</strong> This is the conjugate base of acetic acid.</li></ul><p style="margin-left:0px;">The combination of acetic acid and sodium acetate can work together to neutralize small changes in pH.</p><p style="margin-left:0px;"><strong>Let's analyze the other options:</strong></p><ul><li>NaCl & NaOH: This is a strong base (NaOH) and its conjugate acid (NaCl). Strong bases readily dissociate in water, so this solution wouldn't function effectively as a buffer.</li><li>HCl & NH₄Cl: This is a strong acid (HCl) and its conjugate base (NH₄Cl). Similar to the previous option, a strong acid wouldn't be suitable for a buffer solution.</li><li>CH₃COOH & HCl: This is a mixture of a weak acid (acetic acid) and a strong acid (HCl). The strong acid would overpower the buffering capacity of the weak acid.</li><li>NaOH & Na₂CO₃: This is a strong base (NaOH) and its conjugate acid (Na₂CO₃). As mentioned earlier, strong bases aren't ideal for buffers.</li><li>HCl & NaCl: This is again a strong acid (HCl) and its conjugate base (NaCl). Not suitable for a buffer.</li></ul>
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