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Two samples of HCl of 1.0 M and 0.25 M a...

Two samples of `HCl` of `1.0 M` and `0.25 M` are mixed. Find volumes of these samples taken in order to prepare `0.75 M HCl` solution. Assume no water is added.
(I) `20 mL, 10 mL` (II) `100 mL, 50 mL`k
(III) `40 mL, 20 mL` (IV) `50 mL, 25 mL`

A

I,II,IV

B

I,II

C

II,III,IV

D

I,II,III,IV

Text Solution

Verified by Experts

The correct Answer is:
D

`M_(1) = 1.0 M, M_(2) = 0.25 M`
Let `V_(1)` and `V_(2)` are volumes required
`(1.0 xx V_(1) + 0.25 xx V_(2)) = 0.75 (V_(1) + V_(2))`
`implies 0.25 V_(1) = 0.5 V_(2), implies V_(1) : V_(2) = 2:1`
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