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100 mL H 2 ​ SO 4 ​ 0,1 M direaksikan dengan 200 mL NH 4 ​ OH 0,1 M ( K b ​ = 1 × 1 0 − 5 ) . 1) K b ​ = .... 2) [ H + ] = .... 3) [ OH − ] = .... 4) p H = .... 5) pO H = ....

100 mL  0,1 M direaksikan dengan 200 mL  0,1 M .

1)    = ....

2)    = ....

3)    = ....

4)    = ....

5)    = .... 

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I. Yassa

Master Teacher

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Pembahasan

Senyawa merupakan asam kuat bervalensi 2, sementara merupakan basa lemah. Penyelesaian: 1. Menghitung mol masing-masing senyawa 2. Menuliskan persamaan reaksi Berdasarkan perhitungan diatas, maka dapat disimpulkan bahwa larutan yang terbentuk adalah larutan garam asam yang terhidrolisis parsial. 3. Menentukan konsentrasi garam (NH 4 ) 2 SO 4 4. Menentukan konsentrasi [NH 4 + ] 5. Menentukan [H + ] 6. Menghitung [OH - ] 7. Menghitung pH 8. Menghitung pOH atau memiliki nilai yang sama. Jadi, dapat disimpulkan bahwa : 1) = 2) 3) 4) 5)

Senyawa begin mathsize 14px style H subscript 2 S O subscript 4 end style merupakan asam kuat bervalensi 2, sementara begin mathsize 14px style N H subscript 4 O H end style merupakan basa lemah.

H subscript 2 S O subscript 4 yields 2 H to the power of plus sign and S O subscript 4 to the power of 2 minus sign 

Penyelesaian:

1. Menghitung mol masing-masing senyawa

table attributes columnalign right center left columnspacing 0px end attributes row cell Mol space H subscript 2 S O subscript 4 end cell equals cell M cross times V end cell row blank equals cell 0 comma 1 cross times 100 end cell row blank equals cell 10 space mmol end cell row blank blank blank row cell Mol space N H subscript 4 O H end cell equals cell M cross times V end cell row blank equals cell 0 comma 1 cross times 200 end cell row blank equals cell 20 space mmol end cell end table 

2. Menuliskan persamaan reaksi


Berdasarkan perhitungan diatas, maka dapat disimpulkan bahwa larutan yang terbentuk adalah larutan garam asam yang terhidrolisis parsial.

3. Menentukan konsentrasi garam (NH4)2SO4

table attributes columnalign right center left columnspacing 0px end attributes row M equals cell mol over V end cell row blank equals cell fraction numerator 10 space mmol over denominator 300 space mL end fraction end cell row blank equals cell 1 over 30 M end cell end table 

4. Menentukan konsentrasi [NH4+]

open parentheses N H subscript 4 close parentheses subscript 2 S O subscript 4 end subscript yields 2 N H subscript 4 to the power of plus sign and S O subscript 4 to the power of 2 minus sign sehingga colon open square brackets N H subscript 4 to the power of plus sign close square brackets equals 2 cross times left square bracket open parentheses N H subscript 4 close parentheses subscript 2 S O subscript 4 right square bracket open square brackets N H subscript 4 to the power of plus sign close square brackets equals 2 cross times left parenthesis 1 over 30 M right parenthesis open square brackets N H subscript 4 to the power of plus sign close square brackets equals 2 over 30 M open square brackets N H subscript 4 to the power of plus sign close square brackets equals 0 comma 067 space M 

5. Menentukan [H+]

table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H to the power of plus sign close square brackets end cell equals cell square root of K subscript italic w over K subscript italic b cross times left square bracket kation space garam right square bracket end root end cell row blank equals cell square root of fraction numerator 1 middle dot 10 to the power of negative sign 14 end exponent over denominator 1 middle dot 10 to the power of negative sign 5 end exponent end fraction cross times left parenthesis 0 comma 067 right parenthesis end root end cell row blank equals cell square root of fraction numerator 1 middle dot 10 to the power of negative sign 14 end exponent over denominator 1 middle dot 10 to the power of negative sign 5 end exponent end fraction cross times left parenthesis 67 middle dot 10 to the power of negative sign 3 end exponent right parenthesis end root end cell row blank equals cell square root of 67 middle dot 10 to the power of negative sign 12 end exponent end root end cell row blank equals cell 8 comma 16 middle dot 10 to the power of negative sign 6 end exponent space M end cell end table 

6. Menghitung [OH-]

H subscript 2 O equilibrium H to the power of plus sign and O H to the power of minus sign K subscript italic w italic space end subscript double bond open square brackets H to the power of plus sign close square brackets cross times open square brackets O H to the power of minus sign close square brackets dengan space K subscript italic w italic space end subscript equals 1 middle dot 10 to the power of negative sign 14 end exponent 1 middle dot 10 to the power of negative sign 14 end exponent equals open square brackets H to the power of plus sign close square brackets cross times open square brackets O H to the power of minus sign close square brackets 

table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell fraction numerator K subscript italic w over denominator open square brackets H to the power of plus sign close square brackets end fraction end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell fraction numerator 1 middle dot 10 to the power of negative sign 14 end exponent over denominator 8 comma 16 middle dot 10 to the power of negative sign 6 end exponent end fraction end cell row blank equals cell 0 comma 12 middle dot 10 to the power of negative sign 8 end exponent space M end cell row blank equals cell 1 comma 2 middle dot 10 to the power of negative sign 9 space end exponent M end cell end table

7. Menghitung pH

table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space left parenthesis 8 comma 16 middle dot 10 to the power of negative sign 6 end exponent right parenthesis end cell row blank equals cell 6 minus sign log space 8 comma 16 end cell end table

8. Menghitung pOH

table attributes columnalign right center left columnspacing 0px end attributes row pOH equals cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell negative sign log space left parenthesis 1 comma 2 middle dot 10 to the power of negative sign 9 end exponent right parenthesis end cell row blank equals cell 9 minus sign log space 1 comma 2 end cell end table

atau

table attributes columnalign right center left columnspacing 0px end attributes row pOH equals cell 14 minus sign pH end cell row blank equals cell 14 minus sign left parenthesis 6 minus sign log space 8 comma 16 right parenthesis end cell row blank equals cell 8 plus log space 8 comma 16 end cell end table 

9 minus sign log space 1 comma 2 space dan space 8 plus log space 8 comma 16 space memiliki nilai yang sama.

Jadi, dapat disimpulkan bahwa :

1)   begin mathsize 14px style K subscript italic b end style = begin mathsize 14px style 1 cross times 10 to the power of negative sign 5 end exponent end style

2)   open square brackets H to the power of plus sign close square brackets equals 8 comma 16 middle dot 10 to the power of negative sign 6 end exponent space M 
3)   open square brackets O H to the power of minus sign close square brackets equals 1 comma 2 middle dot 10 to the power of negative sign 9 end exponent space M 
4)   italic p H equals 6 minus sign log space 8 comma 16 
5)   italic p O H equals9 minus sign log space 1 comma 2 space atau space 8 plus log space 8 comma 16 space space

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