0.15 mol of pyridinium chloride has been added into 500 c m 3 of 0.2 M pyridine solution. The pH and O H - ion concentration in the resulting solution assuming no change in volume is ( k b = 1.5 × 1 0 - 9 M )

Question

0.15 mol of pyridinium chloride has been added into 500 c m 3 of 0.2 M pyridine solution. The pH and O H - ion concentration in the resulting solution assuming no change in volume is ( k b = 1.5 × 1 0 - 9 M ), 5,1 0 - 8 m o l / l i t r e, 5,1 0 - 9 m o l / l i t r e, 6,1 0 - 9 m o l / l i t r e, 7,1 0 - 9 m o l / l i t r e

MARKS App · Accepted Answer

pOH = - l o g k b + l o g [ S a l t ] [ B a s e ] = - l o g 1.5 × 1 0 - 9 + l o g 2 × 0.15 0.2 = - l o g 1.5 - l o g 1 0 - 9 + l o g 1.5 = 9 p H = 14 - p O H = 14 - 9 = 5 [ O H - ] = 1 0 - p O H = 1 0 - 9 m o l l - 1

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