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250 mL of a Na(2)CO(3) solution contains...

250 mL of a `Na_(2)CO_(3)` solution contains `2.65 g` of `Na_(2)CO_(3).10mL` of this solution is added to xml of water is obtain `0.001 M Na_(2)CO_(3)` solution. The value of x is :

A

1000

B

990

C

9990

D

90

Text Solution

Verified by Experts

The correct Answer is:
B
Molarity of solution
`M=(w_Bxx1000)/(m_BxxV)=(2.65xx1000)/(106xx250)=0.1`
`M_1V_1=M_2V_2`
`0.1xx10=0.001(10+x)rArrx=990mL`
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