Question

1 L sample of impure water containing sulphide ion is made ammoniacal and is titrated with 300 " mL of " 0.1 M `AgNO_(3)` solution. Which of the following statements is/are correct about the above reaction?
A. The strength of `H_(2)S` in water is `0.51g L^(-1)`
B. The strength of `H_(2)S` in water is `5.1 gL^(-1)`
C. The concentration of `H_(2)S` in water in ppm is 510.
D. The concentration of `H_(2)S` in water in ppm is 51.

Answer 1

Correct Answer - A::C
`m" Eq of "H_(2)S=m" Eq of "S^(2-)=m" Eq of "AgNO_(3)`
`[(W)/((34)/(2))xx1000]=300xx0.1("n-factor"=1)=30`.
`thereforeW_(H_(2)S)=(30xx17)/(1000)=0.51gL^(-1)`
ppm of `H_(2)S=(0.51xx10^(6))/(10^(3))=510`