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NaOH and Na(2)CO(3) are dissolved in 200...

NaOH and `Na_(2)CO_(3)` are dissolved in 200ml aqueous solution. Now methyl orange is added in the same solution titrated and requires 2.5ml of the same HCl. Calculate the normality of NaOH & `NaCO_(3)`.

A

`(0.5)/(200),(1.5)/(200)`

B

`(1.5)/(200),(0.5)/(200)`

C

`(0.5)/(200).(0.5)/(200)`

D

`(1.5)/(200),(1.5)/(200)`

Text Solution

Verified by Experts

The correct Answer is:
B
Let M moles of NaOH = a, `Na_(2)CO_(3)=b`
With phenolphthalein, `eq_(HCl)` = `eq_(NaOH)+(1)/(2)eqNa_(2)CO_(3)`
`17.5xx0.1=axx1+bxx1`
With methyl organe, `eq_(HCl)=(1)/(2)eqNa_(2)CO_(3)`
`2.5xx0.1=bxx1`
`implies a=1.5,b=0.25`
implies `[NaOH]=(1.5)/(200)M=(1.5)/(200)N`
`[Na_(2)CO_(3)]=(0.25)/(200)M=(0.5)/(200)N`
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