Question

2.5 litre of 1 M NaOH solution are mixed with
another 3 litres of 0.5 M NaOH solution. Then,
the molality of the resulting solution is
​

Answer 1

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Asked on October 15, 2019 by

Kanak Vekhande

1 M and 2.5 L NaOH solution mixed with another 0.5 M and 3 L NaOHsolution. Then find out molarity of resultant solution:

A

0.80M

B

1.0M

C

0.73M

D

0.50M

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VIDEO EXPLANATION

ANSWER

Mole of 2.5 L of 1 M NaOH =2.5×1=2.5

Mole of 3.0 L of 0.5 M NaOH =3.0×0.5=1.5

Total moles of NaOH in solution =2.5+1.5=4.0

(Total volume of solution =2.5+3.0=5.5L)

Thus, M

1

×V

1

=M

2

×V

2

4.0=M

2

×5.5

Molarity of resultant solution =M

2

=

5.5

4.0

= =0.73M