Roboguru

Berapakah pH dari 0,1 M Jika ?

Berapakah pH dari begin mathsize 14px style C H subscript 3 C O O Na end style 0,1 M Jika begin mathsize 14px style Ka space C H subscript 3 C O O H equals 1 cross times 10 to the power of negative sign 5 end exponent end style ?

Jawaban:

Penentuan pH larutan hidrolisis garam dari basa kuat dan asam lemah menggunakan rumus,

begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals square root of begin inline style K subscript w over K subscript a end style middle dot open square brackets garam close square brackets end root end style 

maka diperoleh,

begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals square root of begin inline style K subscript w over K subscript a end style middle dot open square brackets garam close square brackets end root space space space space space space space space space space equals square root of begin inline style 10 to the power of negative sign 14 end exponent over 10 to the power of negative sign 5 end exponent end style middle dot left square bracket 10 to the power of negative sign 1 end exponent right square bracket end root space space space space space space space space space space equals square root of 10 to the power of negative sign 10 end exponent end root space space space space space space space space space space equals 10 to the power of negative sign 5 end exponent  pOH equals minus sign log open square brackets O H to the power of minus sign close square brackets space space space space space space space space equals minus sign log space 10 to the power of negative sign 5 end exponent space space space space space space space space equals 5  pH space equals 14 minus sign pOH space space space space space space equals 14 minus sign 5 space space space space space space equals 9 end style 

Jadi pH dari CH3COONa adalah 9

0

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