Question

For a given mixture of NaHCO3 and Na2CO3 volume of a given HCl required is Xml with phenolphthalein indicator and further Yml required with methyl orange indicator. Hence volum6of HCl for complete reaction of NaHCO3 is :??!!​

Answer 1

The uncertainity of a moving bullet of mass 10g is 10^-5 m. Calculate the uncertainity in its velocity?

According to uncertainty principle

Δx.Δmv = ℎ / 4π

Δv = ℎ 4πmΔ

x=6.626 × 10−34 / 4×3

=> ×14×10−2×10−5

=> 5.27×10−28 m/s ...

Answer 2

Answer:

Y-X

Explanation:

Phenolpthalein reacts with only 50% na2co3 to nahco3 and doesn't react with nahco3 so,

1/2(na2co3)=X - - - - - - (1)

While methyl orange indicator react with both nahco3 and 50% na2co3 (here only 50%na2co3 is only left as 50% na2co3 is titrated with Phenolpthalein) then

nahco3 + (1/2)na2co3 = Y - - - - (2)

By solving eq (1) & (2)

We get volume of hcl required for nahco3 is Y-X, and for na2co3 is 2X