Pertanyaan

Amonia sebagai basa lemah diinginkan membentuk larutan dengan pH 10. Konsentrasi larutan amonia yang dibutuhkan sebesar (diketahui ) ….

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Pembahasan

Selanjutnya, dalam menentukan konsentrasi perhitungannya menjadi

begin mathsize 12px style pOH equals 14 minus pH space pOH equals 14 minus 10 equals 4 pOH equals negative log invisible function application open square brackets OH to the power of minus close square brackets open square brackets OH to the power of minus close square brackets equals 10 to the power of negative pOH end exponent equals 10 to the power of negative 4 end exponent end style

Selanjutnya, dalam menentukan konsentrasi perhitungannya menjadi

$begin mathsize 12px style open square brackets OH to the power of minus close square brackets equals square root of straight K subscript straight b cross times straight M end root open square brackets OH to the power of minus close square brackets squared equals straight K subscript straight b cross times straight M straight M equals open square brackets OH to the power of minus close square brackets squared over straight K subscript straight b equals fraction numerator open square brackets 10 to the power of negative 4 end exponent close square brackets squared over denominator 1 , 8 cross times 10 to the power of negative 5 end exponent end fraction straight M equals fraction numerator 10 to the power of negative 8 end exponent over denominator 1 , 8 cross times 10 to the power of negative 5 end exponent end fraction straight M equals fraction numerator 10 cross times 10 to the power of negative 9 end exponent over denominator 1 , 8 cross times 10 to the power of negative 5 end exponent end fraction straight M equals 5 , 56 cross times 10 to the power of negative 4 end exponent end style$