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Sebanyak 100 mL larutan mengandung HCOOH dan HCOONa masing-masing 0,1 M, a. Hitung pH larutan awal b. Hitung pH setelah ditambah 1 mL HCl 0,1 M (tulis reaksi yang terjadi) c. Hitung pH setelah di

Sebanyak 100 mL larutan mengandung HCOOH dan HCOONa masing-masing 0,1 M, begin mathsize 14px style left parenthesis K subscript a equals 10 to the power of negative sign 5 end exponent right parenthesis end style 

a. Hitung pH larutan awal

b. Hitung pH setelah ditambah 1 mL HCl 0,1 M (tulis reaksi yang terjadi)

c. Hitung pH setelah ditambah 1 mL NaOH 0,1 M (tulis reaksi yang terjadi)

Jawaban:

a. pH awal larutan adalah 3

begin mathsize 14px style open square brackets H to the power of plus sign close square brackets equals square root of K subscript a middle dot M end root space space space space space space space space space equals square root of 10 to the power of negative sign 5 end exponent middle dot 10 to the power of negative sign 1 end exponent end root space space space space space space space space space equals square root of 10 to the power of negative sign 6 end exponent end root space space space space space space space space space equals 10 to the power of negative sign 3 space end exponent M  pH equals minus sign log open square brackets H to the power of plus sign close square brackets space space space space space equals minus sign log space 10 to the power of negative sign 3 end exponent space space space space space equals space 3 end style 

b. pH setelah ditambah 1mL HCl 0,1 M adalah 3,5-log 3

begin mathsize 14px style n space H Cl double bond M cross times V space space space space space space space space space space equals 0 comma 1 cross times 1 space space space space space space space space space space equals 0 comma 1 space mmol  n space H C O O H double bond M cross times V space space space space space space space space space space space space space space space space space space equals 0 comma 1 cross times 100 space space space space space space space space space space space space space space space space space space equals 10 space mmol end style 

 

Error converting from MathML to accessible text. 

begin mathsize 14px style M space H C O O H equals mol over volume space space space space space space space space space space space space space space space space space space space equals fraction numerator 9 comma 9 space mmol over denominator 101 space mL end fraction space space space space space space space space space space space space space space space space space space space equals 0 comma 09 space M  open square brackets H to the power of plus sign close square brackets equals square root of K subscript a middle dot M end root space space space space space space space space space equals square root of 10 to the power of negative sign 5 end exponent middle dot 0 comma 09 end root space space space space space space space space space equals 3 cross times 10 to the power of negative sign 3 comma 5 end exponent  pH equals minus sign log open square brackets H to the power of plus sign close square brackets space space space space space equals minus sign log space 3 cross times 10 to the power of negative sign 3 comma 5 end exponent space space space space space equals 3 comma 5 minus sign log space 3 end style    

c. pH setelah ditambah 1 mL NaOH 0,1 M adalah 5-log 0,98

begin mathsize 14px style n space Na O H double bond M cross times V space space space space space space space space space space space space equals 0 comma 1 cross times 1 space space space space space space space space space space space space equals 0 comma 1 space mmol  n space H C O O H double bond M cross times V space space space space space space space space space space space space space space space space space space equals 0 comma 1 cross times 100 space space space space space space space space space space space space space space space space space space equals 10 space mmol end style 

 

begin mathsize 14px style space space space space space space space space space space H C O O H space space space plus space space Na O H space space space space space space space space rightwards arrow space space space space H C O O Na space space space space space space space plus space space space H subscript 2 O M space space space space space space space space 10 space mmol space space space space space space space 0 comma 1 space mmol space space space space space space space space space space space space space space 10 space mmol space space space space space space space space space space space space space space space space minus sign B space space space space space space space space space 0 comma 1 space mmol space space space space space space 0 comma 1 space mmol space space space space space space space space space space space space 0 comma 1 space mmol space space space space space space space space 0 comma 1 space mmol space space S bold space bold space bold space bold space bold space bold space bold space bold space bold space bold 9 bold comma bold 9 bold space bold mmol bold space bold space bold space bold space bold space bold space bold space bold minus sign bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold 10 bold comma bold 1 bold space bold mmol bold space bold space bold space bold space bold space bold space bold space bold 0 bold comma bold 1 bold space bold mmol bold space bold space bold space bold space space space space space end style  

 

begin mathsize 14px style open square brackets H to the power of plus sign close square brackets double bond K subscript a middle dot fraction numerator mol space asam over denominator mol space garam end fraction space space space space space space space space space equals 10 to the power of negative sign 5 end exponent middle dot fraction numerator 9 comma 9 space mmol over denominator 10 comma 1 space mmol end fraction space space space space space space space space space equals 0 comma 98 cross times 10 to the power of negative sign 5 end exponent  pH equals minus sign log open square brackets H to the power of plus sign close square brackets space space space space space equals minus sign log space 0 comma 98 cross times 10 to the power of negative sign 5 end exponent space space space space space equals 5 minus sign log space 0 comma 98 end style 

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