Question

In 1 gram mixture of k2co3 and khc03 mass fraction

Answer 1

Answer:

Correct option is

A

96%K

2

CO

3

,4%Li

2

CO

3

Molecular weight of K

2

CO

3

=39×2+12+48=138g mol

−1

Equivalent weight of K

2

CO

3

=

2

138

=69g

Molecular weight of Li

2

CO

3

=7×2+12+48=74g mol

−1

Equivalent weight of Li

2

CO

3

=

2

74

=37g

Let, x g of K

2

CO

3

and (0.5−x) g of Li

2

CO

3

mEq K

2

CO

3

+ mEq of Li

2

CO

3

= mEq of HCl

(

69

x

+

37

0.5−x

)×1000=30×0.25

69×37

37x+69(0.5−x)

=

1000

30×0.25

69×0.5=

1000

30×0.25×69×37

=32x

34.5−19.14=32x

32x=15.36 and x=0.48

% of K

2

CO

3

=

0.5

0.48×100

=96%

% of Li

2

CO

3

=4%