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Suatu basa lemah  mempunyai konsentrasi sebesar 0,...

Suatu basa lemah begin mathsize 14px style XOH end style mempunyai konsentrasi sebesar 0,02M. Jika ketahui undefined, tentukan konsentrasi undefined dan  begin mathsize 14px style H to the power of plus sign end style dalam larutan tersebut!

Jawaban:

begin mathsize 14px style XOH space end stylemerupakan larutan basa lemah. Untuk menentukan konsentrasi begin mathsize 14px style O H to the power of minus sign end style digunakan rumus :

begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals square root of Kb cross times M end root space space space space space space space space space space space equals square root of 5 middle dot 10 to the power of negative sign 5 end exponent cross times 2 middle dot 10 to the power of negative sign 2 end exponent end root space space space space space space space space space space space equals square root of 1 middle dot 10 to the power of negative sign 6 end exponent end root open square brackets O H to the power of minus sign close square brackets equals 10 to the power of negative sign 3 end exponent end style

Untuk menentukan konsentrasi begin mathsize 14px style open square brackets H to the power of plus sign close square brackets end style digunakan rumus :

begin mathsize 14px style H subscript 2 O subscript open parentheses italic l close parentheses end subscript equilibrium H to the power of plus sign subscript open parentheses italic a italic q close parentheses end subscript plus O H to the power of minus sign subscript open parentheses italic a italic q close parentheses end subscript K subscript w space H subscript 2 O equals 10 to the power of negative sign 14 end exponent open square brackets H to the power of plus sign close square brackets cross times open square brackets O H to the power of minus sign close square brackets equals 10 to the power of negative sign 14 end exponent open square brackets H to the power of plus sign close square brackets cross times open square brackets 10 to the power of negative sign 3 end exponent close square brackets equals 10 to the power of negative sign 14 end exponent space space space space space space space space space space space space space space space open square brackets H to the power of plus sign close square brackets equals 10 to the power of negative sign 11 end exponent end style

Maka, konsentrasi undefineddan  begin mathsize 14px style H to the power of plus sign end style dalam larutan tersebut adalah begin mathsize 14px style 10 to the power of negative sign 3 end exponent space dan space 10 to the power of negative sign 11 end exponent end style.

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