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20 " mL of " x M HCl neutralises complet...

20 " mL of " x M HCl neutralises completely 10 " mL of " 0.1 M `NaHCO_3` solution and a further 5 " mL of " 0.2 M `Na_2CO_3` to methyl orange end point. What is the value of `x`?

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`mEq` of `HCl=mEq` of `NaHCO_3+mEq` of `Na_2CO_3`
`20x xx=10xx0.1+5xx0.2xx2`
`x=(3)/(20)=0.15M`
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