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Hitunglah konsentrasi ion  dalam larutan !

Hitunglah konsentrasi ion begin mathsize 14px style O H to the power of minus sign end style dalam larutan begin mathsize 14px style Ba open parentheses O H close parentheses subscript 2 space 5 cross times 10 to the power of negative sign 4 end exponent space M end style

Jawaban:

Jika diasumsikan larutan sebanyak 1 L, maka

begin mathsize 14px style n subscript Ba open parentheses O H close parentheses subscript 2 end subscript equals 5 cross times 10 to the power of negative sign 4 end exponent cross times 1 n subscript Ba open parentheses O H close parentheses subscript 2 end subscript equals 5 cross times 10 to the power of negative sign 4 end exponent Ba open parentheses O H close parentheses subscript 2 yields Ba to the power of 2 plus sign and 2 O H to the power of minus sign n subscript O H to the power of minus sign end subscript equals 2 cross times n subscript Ba open parentheses O H close parentheses subscript 2 end subscript n subscript O H to the power of minus sign end subscript equals 2 cross times 5 cross times 10 to the power of negative sign 4 end exponent n subscript O H to the power of minus sign end subscript equals 10 to the power of negative sign 3 end exponent open square brackets O H to the power of minus sign close square brackets equals bevelled 10 to the power of negative sign 3 end exponent over 1 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

Dengan demikian, maka jawaban yang tepat adalah 0,001 M.

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