Pertanyaan

Gas HCl murni 12 mL dan 18 mL gas NH 3 murni dilarutkan ke dalam 250 mL air hingga seluruh gas larut dan volume air tidak berubah. Tekanan gas-gas 76 cmHg dan t = 27 0 C. Kalau kemudian kedalam larutan tersebut ditetesi larutan encer Ni(NO 3 ) 2 hingga Ni(OH) 2 tepat jenuh (saat akan mengendap). Jika diketahui log 2 = 0,3, Kw = 10 -14 , Kb = 10 -5 , dan Ksp Ni(OH) 2 = 4 x 10 -14 . [Ni 2+ ] pada saat Ni(OH) 2 tepat jenuh adalah ...

Gas HCl murni 12 mL dan 18 mL gas NH₃ murni dilarutkan ke dalam 250 mL air hingga seluruh gas larut dan volume air tidak berubah. Tekanan gas-gas 76 cmHg dan t = 27⁰C. Kalau kemudian kedalam larutan tersebut ditetesi larutan encer Ni(NO₃)₂ hingga Ni(OH)₂ tepat jenuh (saat akan mengendap). Jika diketahui log 2 = 0,3, Kw = 10^-14, Kb = 10^-5, dan Ksp Ni(OH)₂ = 4 x 10^-14. [Ni²⁺] pada saat Ni(OH)₂ tepat jenuh adalah ...

1,6 x 10^-3 M
2 x 10^-4 M
3 x 10^-4 M
4 x 10^-4 M
5 x 10^-4 M

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space space space space space space space space space equals space 0 comma 0005 space mol space equals space 5 space cross times space 10 to the power of negative 4 end exponent space mol space Jumlah space mol space NH subscript 3 equals space fraction numerator left parenthesis 1 space atm space cross times space 0 comma 018 space straight L right parenthesis over denominator space left parenthesis 0 comma 08 space cross times space 300 right parenthesis space end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 0 comma 00075 space mol space equals space 7 comma 5 space cross times space 10 to the power of negative 4 end exponent mol Reaksi space yang space terjadi colon space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space HCl space space space space space space space space space space space space space plus space space space space space space space space space space space space space space NH 3 space space space space space space space space space space space rightwards arrow space space space space NH 4 Cl space Mula minus mula space colon space space 5 space cross times space 10 to the power of negative 4 end exponent space mol space space space space space space space space space space space 7 comma 5 space cross times space 10 to the power of negative 4 end exponent mol space space space space space space space space space space space space space space space space space space minus space Reaksi colon space space space space space space space space minus 5 space cross times space 10 to the power of negative 4 end exponent space mol space space space space space space space space space minus 5 space cross times space 10 to the power of negative 4 end exponent space mol space space space space space space space space space space space 5 space cross times space 10 to the power of negative 4 end exponent space mol stack Sisa space colon space space space space space space space space space space space space space space space space space space minus space space space space space space space space space space space space space space space space space space space space space space 2 comma 5 space cross times space 10 to the power of negative 4 end exponent space mol space space space space space space space space space space space 5 space cross times space 10 to the power of negative 4 end exponent space mol with bar on top Larutan space yang space terbentuk space adalah space larutan space penyangga space karena space yang space tersisa space adalah space larutan space basa space lemah comma space maka space didapatkan colon space OH minus space equals space Kb space. space fraction numerator m o l space b a s a space l e m a h over denominator m o l space g a r a m end fraction space space space OH minus space equals space 10 to the power of negative 5 end exponent space. space space fraction numerator 2 comma 5 space cross times space 10 to the power of negative 4 end exponent over denominator 5 space cross times space 10 to the power of negative 4 end exponent end fraction equals space 5 space cross times space 10 to the power of negative 6 end exponent space space space Ni left parenthesis OH right parenthesis subscript 2 space left right arrow space space Ni to the power of 2 plus end exponent space plus space 2 OH to the power of minus space Karena space larutan space tersebut space tepat space jenuh comma space maka space Ksp space equals space Qsp space space 4 space cross times space 10 to the power of negative 14 end exponent space space equals space left square bracket Ni to the power of 2 plus end exponent right square bracket space left square bracket OH minus right square bracket squared space 4 space cross times space 10 to the power of negative 14 end exponent space space equals space left square bracket Ni to the power of 2 plus end exponent right square bracket space left square bracket 5 space cross times space 10 to the power of negative 6 end exponent right square bracket squared space left square bracket Ni to the power of 2 plus end exponent right square bracket space equals fraction numerator 4 space cross times space 10 to the power of negative 14 end exponent space over denominator 25 space cross times space 10 to the power of negative 12 end exponent space end fraction space space equals space 1 comma 6 space cross times space 10 to the power of negative 3 end exponent space straight M end style$

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