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Q.

What quantity (in mL) of a 45% acid solution of a mono-protic strong acid must be mixed with a 20% solution of the same acid to produce 800 mL of a 29.875% acid solution?

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a

320

b

316

c

330

d

 325

answer is B.

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Detailed Solution

N1V1+N2V2=NV

V1 = x ml, V2 = (800-x) ml and V = 800 ml

45x + 20(800-x) = 29.875(800)

On solving, we get

x= 316

Hence the correct option is B.

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