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The volumes of two HCl solutions A (0.5N...

The volumes of two HCl solutions A (0.5N) and B(0.1N) to be mixed for preparing 2 L of 0.2 NHCl are:

A

0.5 L of `A^(+) 1.5L` of B

B

1.5L of `A+0.5L` of B

C

1L of `A+1L` of B

D

0.75L of `A+1.25L` of B

Text Solution

Verified by Experts

The correct Answer is:
A
Let x L of A and (2-x) L of B are mixed
`((N_(1)V_(1) + N_(2)V_(2))/(V_(1) +V_(2)))= N_(3)`
`0.5 xx x+ 0.1 (2-x) = 0.2 xx 2 rArr (0.5-0.1) x= 0.4- 0.2`
`0.4 x= 0.2 rArr x= 0.5 rArr therefore 0.5` L of A and 1.5L of B should be mixed.
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Knowledge Check

  • The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250 mL of 2 M HCl will be

    A
    `1.00 M `
    B
    `1.75 M`
    C
    `0.975`
    D
    `0.875`

  • The pH of a solution obtained by mixing 50 mL of 0.4 NHCI and 50 mL of 0.2 N NaOH is:

    A
    `-log 2`
    B
    `-log 0.2`
    C
    1
    D
    2

  • In Kjeldahl's method, 29.5 mg of an organic compound containing nitrogen was digested and the evolved ammonia was absorbed in 20 mL of 0.1 NHCl solution. The excess of the acid required 15 mL of 0.1 N NaOH solution for complete neutralization. The percentage of nitrogen in the compound is

    A
    29.5
    B
    `59.0`
    C
    47.4
    D
    23.7

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