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Diketahui pH dari HCl = 2. Tentukan massa HCl yang dilarutkan dalam 1 liter air.

Pertanyaan

Diketahui pH dari HCl = 2. Tentukan massa HCl yang dilarutkan dalam 1 liter air.

Pembahasan Soal:

HCl adalah asam kuat bervalensi 1. Penentuan massa HCl dapat dihitung berdasarkan data kemolaran (konsentrasi).

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 2 equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row cell space open square brackets H to the power of plus sign close square brackets end cell equals cell 10 to the power of negative sign 2 end exponent end cell row blank blank blank row cell H Cl end cell rightwards arrow cell H to the power of plus sign and Cl to the power of minus sign space left parenthesis a space colon space 1 right parenthesis end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell a cross times M end cell row M equals cell fraction numerator open square brackets H to the power of plus sign close square brackets over denominator a end fraction end cell row blank equals cell 10 to the power of negative sign 2 end exponent over 1 end cell row blank equals cell 0 comma 01 space M end cell row M equals cell n over V end cell row n equals cell space M cross times V end cell row blank equals cell 0 comma 01 space M cross times 1 space L end cell row blank equals cell 0 comma 01 space mol end cell row blank blank blank row cell M subscript r space H Cl end cell equals cell 1 plus 35 comma 5 equals 36 comma 5 space g forward slash mol end cell row massa equals cell mol cross times M subscript r end cell row cell massa space H Cl end cell equals cell 0 comma 01 space mol cross times 36 comma 5 space g forward slash mol end cell row blank equals cell 0 comma 365 space gram end cell end table 

 

Jadi, massa HCl yang dilarutkan dalam 1 liter air adalah 0,365 gram.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 06 Mei 2021

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