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An acidic buffer solution has [HA] = 1.0...

An acidic buffer solution has [HA] = 1.0M and [NaA] = 1.0M. To (10+x) mL of this buffer solution 9ml of 1.0M HCl is added so that `P^H` changes by 1 unit. The value of 'x' is
A) 0.1
B) 10
C) 1.5
D) 1.0

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