the pH of a NaOH solution is 10. if water is added to it its pH will be.(a) remains same (b) increases (c) decreases (d) becomes 7

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Solution

$O n a d d i n g w a t e r t h e c o n c e n t r a t i o n o f t h e O H^{-} i o n d e c r e a s e s a n d m a k i n g t h e p O H v a l u e m o r e . A s t h e p O H m o r e, p H + p O H = 14 p H = 14 - p O H = L e s s . p H v a l u e d e c r e a s e s . T h u s a c o n c e n t r a t e d b a s e b e c o m e s w e a k o n d i l u t i o n .$

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