Question

100 ml of a salt solution with concentration 15%
(w/v) is mixed with 150 ml of another salt
solution having concentration 25% (w/v). The
concentration (w/v%) of final solution will be
30%
15%
21%
10%​

Answer 1

Answer:

concentration of salt in the first solution-

100×15/100

= 15 gm

concentration of salt in the second solution-

150×25/100

=37.5 gm

∴ concentration (w/v%) of final solution will be -

(37.5+15)/(150+100)× 100

52.5/250×100

= 21%

Answer 2

Given : 100 ml of a salt solution with concentration 15% (w/v) is mixed with 150 ml of another salt solution having concentration 25% (w/v).

To Find : The concentration (w/v%) of final solution will be

30%

15%

21%

10%​

Solution:

100 ml of a salt solution with concentration 15% (w/v)

=> Volume = 100 ml

  Salt weight = (15/100) * 100 = 15 g

150 ml of a salt solution with concentration 25% (w/v)

=> Volume = 150 ml

  Salt weight = (25/100) * 150 = 37.5 g

Volume = 100 + 150 = 250  ml

Salt weight = 15 + 37.5  = 52.5 g

concentration (w/v ) % of final solution  = (52.5/250) * 100  =  21 %

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