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Hitunglah [ OH − ] campuran pada: 250 mL Ba ( OH ) 2 ​ ( a q ) 0,05 M dicampurkan dengan 750 mL NH 4 ​ OH ( a q ) 0,04 M ( K b ​ = 1 0 − 5 )

Hitunglah campuran pada:

250 mL 0,05 M dicampurkan dengan 750 mL 0,04 M space

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S. Lubis

Master Teacher

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Ba ( OH ) 2 ​ → Ba 2 + + 2 OH − terionisasi sempurna sehingga bersifat basa kuat, sehingga untuk menghitung mol ion hidroksida dalam barium hidroksida: [ OH − ] = b × M [ OH − ] = 2 × 0 , 05 [ OH − ] = 0 , 1 M mol OH − = [ OH − ] × V mol OH − = 0 , 1 M × 0 , 25 L mol OH − = 0 , 025 mol Menghitung mol ion hidroksida dalam amonium hidroksida: Menghitung konsentrasi ion hidroksida dalam campuran:


terionisasi sempurna sehingga bersifat basa kuat, sehingga untuk menghitung mol ion hidroksida dalam barium hidroksida:


Menghitung mol ion hidroksida dalam amonium hidroksida:


begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals square root of K subscript b cross times open square brackets N H subscript 4 O H close square brackets end root open square brackets O H to the power of minus sign close square brackets equals square root of 10 to the power of negative sign 5 end exponent cross times 0 comma 04 end root open square brackets O H to the power of minus sign close square brackets equals square root of 4 cross times 10 to the power of negative sign 7 end exponent end root open square brackets O H to the power of minus sign close square brackets equals 6 comma 32 cross times 10 to the power of negative sign 4 end exponent space M mol space O H to the power of minus sign double bond open square brackets O H to the power of minus sign close square brackets cross times V mol space O H to the power of minus sign equals 6 comma 32 cross times 10 to the power of negative sign 4 end exponent space M cross times 0 comma 75 space L mol space O H to the power of minus sign equals 4 comma 74 cross times 10 to the power of negative sign 4 end exponent space mol end style


Menghitung konsentrasi ion hidroksida dalam campuran:


 begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals fraction numerator mol space total over denominator V space total end fraction open square brackets O H to the power of minus sign close square brackets equals fraction numerator left parenthesis 0 comma 025 plus 4 comma 74 cross times 10 to the power of negative sign 4 end exponent right parenthesis space mol over denominator left parenthesis 0 comma 25 plus 0 comma 75 right parenthesis space L end fraction open square brackets O H to the power of minus sign close square brackets equals fraction numerator 0 comma 025474 space mol over denominator 1 space L end fraction open square brackets O H to the power of minus sign close square brackets equals 0 comma 025474 space M end style 


begin mathsize 14px style bold Jadi bold comma bold space bold open square brackets O H to the power of bold minus sign bold close square brackets bold space bold dalam bold space bold campuran bold space bold adalah bold space bold 0 bold comma bold 025474 bold space italic M bold. end style space

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