First slide

PH of strong acids and strong bases

Question

Which mixture forms a buffer when dissolved in 1 L of water?

Moderate

A

0.2 mol NaOH + 0.2 mol HBr
B

0.2 mol NaCl + 0.2 mol HCl
C

0.4 mol HNO₂ + 0.2 mol NaOH
D

0.5 mol NH₃+ 0.5 mol HCl

Solution

Following reaction will occur
HNO₂ +NaOH $\to$ NaNO₂ +H₂O
(weak acid) (strong base)        (salt)
mole 0.4 0.2          0             0
$t = t_{\infty}$ 0.4 - 0.2 = 0.2 0.2 - 0.2 = 0       0.2             0
The resultant solution contains a weak acid & its salt and we have an acidic buffer.

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