Home
Class 12
CHEMISTRY
What [H(3)O^(o+)] must be maintained in ...

What `[H_(3)O^(o+)]` must be maintained in a saturated `H_(2)S` solution to precipitate `Pb^(2+)` but not `Zn^(2+)` from a solution in which each ions is `0.01M` ? `K_(sp) H_(2)S = 1.1 xx 10^(-22),K_(sp) ZnS = 1.0 xx 10^(-21)`

Text Solution

Verified by Experts

For `ZnS` not to be precipitate from a solution of `Zn^(2+)` and `Pb^(2+),IP_(ZnS)ltK_(sp(ZnS))`
`[Zn^(2+)][S^(2-)] ltK_(sp) of ZnS`
`[10^(-2)][S^(2-)] lt1.0xx10^(-21):.[S^(2-)lt10^(-19)M`
so at `[S^(2-)]=10^(-19)M` or less no precipitaion of `ZnS` will occur.
`H_(2)S hArr 2H^(+)+S^(2-)`
`:.[H^(+)]^(2)[S^(2-)]=K_(sp(H_(2)S))=1.1xx10^(-22):.[H^(+)]_(min)^(2)=1.1xx10^(-22)`
`[H^(+)]_(min)^(2)=11xx10^(-4):.[H^(+)]_(min)=3.3xx10^(-22)`
Thus if `[H^(+)=3.3xx10^(-2)M` or more the precipitaion of `ZnS` will not take place and only `PbS` will precipitate .
Promotional Banner

Topper's Solved these Questions

  • IONIC EQUILIBRIUM

    RESONANCE ENGLISH|Exercise Solved Example Miscellaneous solved problems|13 Videos

  • IONIC EQUILIBRIUM

    RESONANCE ENGLISH|Exercise Board Level Exercise|27 Videos

  • HYDROCARBON

    RESONANCE ENGLISH|Exercise ORGANIC CHEMISTRY(Hydrocarbon)|50 Videos

  • IUPAC NOMENCLATURE & STRUCTURAL ISOMERISM

    RESONANCE ENGLISH|Exercise Advanced Level Problems Part-5|2 Videos

Similar Questions

Explore conceptually related problems

What (H_(3)O^(+)) must be maintained in a saturated H_(2)S solution to precipitate Pb^(2+) , but not Zn^(2+) from a solution in which each ion is present at a concetration of 0.01 M ? (K_(SP) for H_(2)S= 1.1xx10^(-22), K_(SP) for ZnS=1.0xx10^(-21))

What [H^(+)] must be maintained in a saturated H_(2)S(0.1)M to precipitate CdS but not ZnS if [Cd^(2+)]=[Zn^(2+)]=0.1 initially? K_(sp) of ZnS = 1 X 10^(-21) K_a of H_2S is 1.1 X 10^(-21)

Calculate [H^(o+)] in a soluton that is 0.1M HCOOH and 0.1 M HOCN. K_(a)(HCOOH) = 1.8 xx 10^(-4), K_(a) (HoCN) = 3.3 xx 10^(-4) .

It is given that 0.001 mol each of Cd^(2+) and Fe^(2+) ions are contained in 1.0L of 0.02M HC1 solution. This solutions is now saturated with H_(2)S gas at 25^(@)C . a. Determine whether or not each of these ions will be precipitated as sulphide? b. How much Cd^(2+) ions remains in the solution at equilibrium? K_(1)(H_(2)S) = 1.0 xx 10^(-7), K_(2) (H_(2)S) = 1.0 xx 10^(-14) : ltbRgt K_(sp) (CdS) = 8 xx 10^(-27): K_(sp) (FeS) = 3.7 xx 10^(-19) .

What is the maximum molarity of Co^(+2) ions in 0.1M HC1 saturated with 0.1M H_(2)S. (K_(a) = 4 xx 10^(-21)) . Given: K_(sp) of CoS = 2xx10^(-21) .

A lead salts is dissolved in HC1 which si 94% ionised. It is found to have 0.1M Pb^(2+) and 0.28M H^(o+) ions. The solution is satured with H_(2)S(g) . Calculate the amount of Pb^(2+) ions that remains unprecipitated. K_(sp) of PbS = 4 xx 10^(-29) , K_(sp) of H_(2)S = 1.1 xx 10^(-22)

Calculate pH at which Mg(OH)_(2) begins to precipitate from a solution containing 0.10M Mg^(2+) ions. (K_(SP)of Mg(OH)_(2)=1xx10^(-11))

Find the concentration of H^(o+), HCO_(3)^(Θ) , and CO_(3)^(-2) in a 0.01M solution of carbonic acid if the pH of solution is 4.18 . K_(1) = 4.45 xx 10^(-7),K_(2) = 4.69 xx 10^(-11)

Find the concentration of H^(o+), HCO_(3)^(Θ) , and CO_(3)^(-2) in a 0.01M solution of carbonic acid if the pH of solution is 4.18 . K_(1) = 4.45 xx 10^(-7),K_(2) = 4.69 xx 10^(-11)

What is [H^(+)] in a solution that is 0.01 M in HCn and 0.02 M in NaCN ? (K_(a) for HCN 6.2 xx 10^(-10))