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Berapa gram natrium asetat () yang harus ditambahk...

Berapa gram natrium asetat (M subscript r equals 82) yang harus ditambahkan ke dalam 200 mL larutan asam asetat 0,1 M (K subscript a equals 10 to the power of negative sign 5 end exponent) agar diperoleh larutan dengan pH = 4.space 

Jawaban:

Campuran antara asam lemah dan garamnya akan membentuk larutan penyangga asam.

pH equals 4 yields open square brackets H to the power of plus sign close square brackets equals 10 to the power of negative sign 4 end exponent 

table attributes columnalign right center left columnspacing 0px end attributes row cell n space C H subscript 3 C O O H end cell equals cell V cross times M end cell row blank equals cell 200 space mL cross times 0 comma 1 space M end cell row blank equals cell 20 space mmol end cell end table 
 

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 K subscript a cross times fraction numerator open square brackets C H subscript 3 C O O H close square brackets over denominator open square brackets C H subscript 3 C O O Na close square brackets end fraction end cell row cell 10 to the power of negative sign 4 end exponent end cell equals cell 10 to the power of negative sign 5 end exponent cross times fraction numerator begin display style bevelled fraction numerator 20 space mmol over denominator 200 space mL end fraction end style over denominator begin display style bevelled fraction numerator n space C H subscript 3 C O O Na over denominator 200 space mL end fraction end style end fraction end cell row cell n space C H subscript 3 C O O Na end cell equals cell fraction numerator 20 space mmol cross times 10 to the power of negative sign 5 end exponent over denominator 10 to the power of negative sign 4 end exponent end fraction end cell row cell n space C H subscript 3 C O O Na end cell equals cell 2 space mmol end cell end table


table attributes columnalign right center left columnspacing 0px end attributes row cell m space C H subscript 3 C O O Na end cell equals cell n cross times M subscript r end cell row blank equals cell 2 space mmol cross times 82 space mg forward slash mmol end cell row blank equals cell 164 space mg end cell row blank equals cell 0 comma 164 space g end cell end table 


Jadi, massa natrium asetat yang harus ditambahkan sebesar 0,164 g.

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