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Q.

A buffer solution made with ${NH}_{3}$ and ${NH}_{4} Cl$ has a $pH$ of 10.0. Which procedure(s) could be used to lower the $pH$ ?
1. Adding HCI 2. Adding ${NH}_{3}$
3. Adding ${NH}_{4} Cl$

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a

1 only

b

2 only

c

1 and 3 only

d

2 and 3 only

answer is C.

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Detailed Solution

Addition of acidic substances shall lower the $pH$ ..

So, Adding $HCl$ and ${NH}_{4} Cl$ will lower the $pH$ .

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